My son was playing a new video game. After he finished I asked him about it and he told me that was good but some buttons were inverted and he had to get used to that. He did not know or asked himself if maybe there are options to change the buttons/controls.
Same with your mother, she will not even know or consider the side loading app idea, this will happen only you are hit with things like your application or books are removed from your device, or a popular application is not approved because of political or moral issues.
Other example is ad blocking, my relatives do not ask me randomly , "hey is there something that can block ads?" , I need to notice they are missing an ad blocker, then explain why should install one and install one for them.
Btw my parents don't play video games, so since you decided if parents don't need something then is useless let's get rid of video games.