The built in charging thing probably goes along with my lines of trying to keep it simple. But I suppose there really isn't anything wrong with them. It's really just a personal choice. Mode spacing is also important to me. Let's see: the mode spacing on the SF-R26 is 1200/250/100/10. You won't notice as big of a difference between 250 and 1200 as you will between 10 and 100. If changing just one of the outputs I would elect that the 100 lumens to somewhere around 60. Also I'd change the 250 to something like 350 and the 10 to 3 or 4 lumens. It's hard to find perfect mode spacing in lights though. Probably because everyone has different tastes.
The deal is that our eyes perceive brightness in a more logarithmic fashion rather than linear. In other words 20 lumens is twice as bright as 10 lumens but you your eyes won't see it that way. Since the LED will get pretty hot at the 1000 lumen + level, most XP-L / XM-L2 lights will have a step down after a few minutes. I don't see the highest mode as a usable option to just leave it there but more as a momentary spotting type of action. Thus the next level down is the one that would be used the most if needing constant max brightness out of the light. Therefore it makes sense to have the 2nd level down low enough that you don't have any thermal problems but high enough that its taking advantage of the LEDs capability. I'm not really a moonlight mode guy but I do like a fairly low low level in the 3 lumen area. Then it looks very proportional to go from 3 up to around 30 lumens. Basically 10 times the lumens looks like twice the brightness to our eyes if I remember correctly. So 3/30/300/3000 would be great. But of course the XP-L can't hit 3000 lumens so you just design it to its max capability and use the 300 level when needing a constant high output. That is my ideal mode spacing but it may not be someone else's.
Mostly I end up looking over the specs of a light and if the price is right will buy knowing that I can turn around and sell it for a small loss if I don't like it. You check out the specs and operation on paper, but its not until you get it into your hands that you know if you're going to like it or not. Sorry ramblin too much. Hope this helps.