I am not going to install linux due to my program requirements for work not having official support

Fair!

That’s fine but it’s weird to expect widespread use when convenience is considered a waste

I don't think it's just about saving dev time (though that is also a big part of it) but also that many people, such as myself as well as most people who make open source programs, genuinely think that the terminal is more convenient than a gui. This is a niche position though and as you say an obstacle to mainstream use.

I do wonder how far away we are from a linux for casual use that you can use without the terminal, since there are already a couple of gui tools for common tasks. In my mind, the average casual user mostly uses maybe their browser, spotify, office products, steam (which may require installing a different graphic card driver, which isn't very user friendly), some messaging platform and photoshop or something. Honestly this shouldn't be that hard to do with just gui tools, modulo the graphic card drivers. Comparability with various programs is a problem though, you might have to settle for libre office and gimp instead of ms office and photoshop for example.