The lack of sound doesn't bother me nearly as much as the multiple sound volume options in the preferences menu. Why have the options if you don't have sound anyway.
Kind of lazyness/don't fix what's not broken I would guess. All these options are there by default when you make a Ren'Py game, just like text box size and text font or the key binds like "H". Many games do not change these preferences because they may not care, they may be new to programming and don't want to fiddle around in places where they don't need to, whatever.
I'm always willing to admit a personal screw up.
I'm not the most savy here. But I've built an impression that the folk who come for the compressed files have been around a while. Are familiar with most of the process involved in getting the games to work.
I wasn't questioning your savvyness. In fact I would have no idea about it. To me, but that may be a bias, using compressed versions is more a combination of maybe low internet speed/volume, using small monitors so all that crazy 4k stuff is of no use anyway, what have you. But even with tech savvy people, checking the basics first will remove a good percentage of errors and they're easy to check unlike some weird driver/card combos people might use and where you might first have to explain how to get that info in the first place. And if multiple options have around the same expected level of success you start with the one that is easiest to do and work from there.