All the above is mostly right for both of you. I do think normal adults should just use a computer, but I get more and more people are having only phones. And still don't have a test unit, but there are some pretty good testing emulators now. So while haven't actually developed for mobile in a long time, more resources now to make it more easy. So will likely happen at some point for TL2 ;P
I hope the emulators will work out for you, they can be heavy on a computer but they had improved significantly over the years. The only two I had tried are Bluestacks and Androidx86
I have a desktop computer, but I personally I prefer to play on mobile because it's more comfy, private, and accessible. I also prefer to lie down when I am "gaming", even if most of the time I find issues [reduced quality for mobile performance, game breaking bugs, phone overheating, faster battery drain, lag, crashes, fixing bugs, configuring steamlink, really bad controls, weird quality issues, less storage, etc. I am starting to think I am a masochist...]
I have a laptop now though, that's much better :D. Previously I only had a desktop computer
I think some people can't afford them in some countries. Personally I don't want to buy another laptop, I spent like a whole month worth of my income into building a new desktop pc