By now I've acquired quite a number of the latest model flashlights. Not the big buck 500+ dollar versions, but the simple easy to purchase 20 to 40 buck models. Not one that I've bought thus far has had just a simple on and off switch and nothing else. Yep they've all had bonus features that I really don't need or want. I'd love to get just a bright flashlight that went on and then off with nothing else in between. Most all of my lights are what they call "five function". They go from high, medium, low, (light intensity), then strobe and finally S.O.S. I just don't get it. I have a new bicycle light that has yep, all five modes on it. I simply cannot see the use of going down the road flashing out S.O.S. to passers by? I also just got a headlamp for my gun work and other project type close in work. It came with two functions only. I had hope for this one with only two (sorry I guess it has three) functions. High, medium, and strobe. Why on earth would I need to be working on my RC model airplane with an unadjustable strobe light on my head???? When I got my latest, a UV flashlight I was in shock. As it had only two modes that it could possibly be in. Yep that's right, only two. On and off. Are manufacturers listening? Smithy.
The answer to this is multi sided.
First off, there are still single mode lights about. But I agree, not so many. But there maybe a valid reason for this.
Then there are also plenty of lights, that can act as though single mode, so despite having other functions, you need not see them unless you want too.
But I think first we need to consider and look at why there are different modes.
For different output levels this is also multi-fold, as they are likely there to address:
-Runtime
-Heat management
-Intended use.
Today many torches offer very high output. This is great for lumen headlines, but the reality is, the highest mode will drain the batteries quickly. For example, if you had a 16340/14500 powered light pulling 2.8-3.0amps with only a single mode. Total runtime would be maybe 15-20mins and down to 10 mins on poorer batteries. Lower modes simply give you so much more flexibility. Not just in runtime, but if the batteries deplete so that they can't power the high mode (the amp draw might trip the batteries circuit protection if it's a protected ICR battery), then a lower mode will be kinder on the battery and likely allow you to keep using the torch.
Heat management is related in many ways to runtime and output. A high output compact torch simply can't shed the heat quick enough. So while the battery might be able to power it for longer, it might simply get too hot to hold. With a single mode light, all you can do is turn it off or grab some oven gloves. Lower modes will allow you to continue using the light and reduce the heat being generated.
Intended use. This goes hand in hand with output and beam profile. e.g. a 1200 lumen (real 1200 lumens) is great for shining across a field, but try and read a map or a book with it and it'll be impossible from all the glare. Lower output modes therefore offer versatility to a torch.
In terms of the blinky modes, I agree they are more of a niche want and need. And the reality is, only a few people will find a use for them. But in terms of things like SOS, they exist simply because having a multi mode light that changes brightness each time you turn it on/off, means you can't really use it for Morse code like you would with a single mode light.
The strobe is certainly more of a novelty feature on most lights. But it's just so easy to achieve with the electronics and certainly in the earlier days it added a degree of "wow" factor to LED lights, because they did things most incan lights couldn't. And the reason you find this feature so often is simply mass production. The chips that make up the drivers are all built and sold on mass. So it's cheaper and easier to use them across many flashlight types.
Solutions?
Well there are plenty.
Many lights can be had that don't have any blinky modes on at all, or ones that allow you to switch them off. For example, the standard driver in most Convoy flashlights allows you the user to choose if it has the blinky modes or not.
Other lights (usually premium ones) have advanced user interfaces which hide such features. Olight is a nice example of this. You have to perform an exact button sequence click to see the strobe mode. If you don't you'll never see them.
In terms of single mode use. As I said, there are still some lights you can get that are single mode. But other options include lights with mode memory. Basically it'll turn on in the mode you left it. So the most used mode should be the one you get.
There are also plenty of lights that always start in high. Most Klarus lights tend to be like this. So in effect when you turn it on, it's always in high. This would give equivalent to a single mode use. The last option is pick a light with an advanced UI that allows you to activate the light in the mode of your choosing. Olight do this, for example on the S15, if you double click from off you'll always get high. So you can use it like a single mode light.
The last option is to build or modify lights to your own design. There are lots of bits you can buy to assemble a light.
However, as an example, here is a really great light that you can opt to buy as a single mode light:
http://intl-outdoor.com/xintd-c8-v5-xml2-u3-multioption-18650-flashlight-p-308.html