I use things because my expectation is that by using the thing, my overall experience and outcome will be better than than if I did not use the thing.

Sometimes, proximity has something to do with it, as would familiarity. And as I've pointed out, there are reasons I use a cell phone that might mean it is physically with me - so since it is with me, why wouldn't I use it for other things as well, even if it weren't the perfect thing to use, since I already have it with me?

Think of it like going camping. Are you going to bring every pot, pan, whisk, spatula in your kitchen, because those are what you would use to cook a small feast at home? Nope, you are going to only bring the fewest things you need to get the job done. That might be a tin cup and a fork. Are those the best tools for everything you plan to do with them? Nope, but they will keep you fed and hydrated.

How specialized we get with our tools is a reflection of our means and circumstance, as well as the attention and focus we bring to the task. If I live in luxury but don't have any interest in working on cars, I won't have an extensive specialized tool collection.

While some of what I stated was self-inflicted and rectifiable, once you start digging into solutions, it immediately becomes apparent that you are moving contrary to convenience, and suggesting specialized solutions that would require additional attention and focus, as well as perhaps the luxury of time to figure them all out.