Not too much mention of tasks here per se, more about where X is carried/left in case its needed, etc.
For me, its like the beam profile is a key that fits into a particular lock.
The locks are also in subsets, as other factors such as UI and form factor of the light itself, also control the selection of a light.
So, I might have two lights with similar beam shapes and sizes, but with different UI and/or form factors. Run time and robustness would be additional factors that might further the selection process.
For example, for an inspection of a site for forensic evidence, say a long dark crawlspace where something might be hidden, or for damage, etc...I might want a tight beam if I have to shine it through a tight line of sight to see to the end clearly, as glare from obstructions on the way to the end, etc, might impair my ability to make out distant details, so an aspheric beam pattern might be ideal to put a small patch of light on a distant target obscured by plumbing and electric, insulation, HVAC, etc. A DEFT edc LR+ for example might be a good choice, given the warm tint and color rendition, and pocket sized form factor which is easier to use in a tight crawlspace, etc.
The need to target a distant object with enough lux to make out details can also require context in some cases, as a bright spot on a target surrounded by dark can lead to only being able to SEE the light, and no details about what the light is ON. A larger beam pattern, that covers a larger surface area with light, is typically more useful in that regard.
If I use a light that throws a large wall of light, so that the scene is closer to day light than to dark, that is typically best to scan an entire field, warehouse, or other large area at once. If the RANGE of the lux I get from that wall of light on the desired surfaces is telling me what I need to know about what's out there, that's great....but, if the act of spreading all those lumens out over such a large area has reduced the lux to the point where I can't see the needed level of detail....then I either need a larger flood light, or, I have to bite the bullet, and concentrate my available lumens into a smaller area to raise the lux there.
HOW much smaller an area I have to concentrate them into depends on the range, and the lux level needed. The further away the area of concern is, the harder it is to generate enough lux on target, and the larger the area of target needed, the harder it is to light it adequately.
Add to the above that the light will need to be aimed at that area, and, probably carried to that point its aimed from, and so forth.
I might need to sidelight a surface texture, and want a diffuse beam that would gently illuminate a broad area of material perpendicularly to highlight the material's texture, if there is dust on it, and if the dust has tracks or other disturbances...a tight beam sucks for that, and it takes enough lumens to spread out broadly, yet project across the surface far enough to see the patterns.
So, as an example, lets say I need to see if there might be victims/survivors on the other side of a ravine, and that means seeing human sized targets potentially laying in weeds or a wooded environment, at perhaps 400 meters. If they are wearing white shirts, lots of options, if they are wearing dark clothing, very hard to resolve. If I have a Fenix TK70, I can probably just make them out at that range, and search a decent amount of area at a time. If I have a Deerelight Aspheric, I can reach that range, but only see a few yards at a time. I am looking at a nice, brightly lit square patch of LED shaped light, a few yards at a time...and might have a field of view with just part of a leg in it, and not recognize it as a person...as there's no context. If I had a larger beam, I might see that same part of a leg, plus part of a head about where a head would be if that were a leg, and mentally be able to recognize that that it might be a person, etc.
If the ravine was a bit wider, so I might need to see 600 meters, the TK70 is now too dimly lighting that area to resolve that level of detail...and I might switch to a dedomed Olight SR90, or HID, or aspheric, which still had the range to resolve targets....but which does require me to look at a smaller area at a time.
If the search is too long, the HID might use up its charge, and/or I am unable to get through the terrain carrying too many lights/too much equipment, etc.
So, if I tried to use one light to do all the above, with the above being a teeny cross section of what I might USE a light for (Tasks), I would find that NO light can do all of the above, and that's just for THOSE tasks.