installing trough package manager has been the default on Linux for what, 20 years now? it was called installing from sources instead of side loading, but it wasn't the default, and it's something you can do anyway in both iPhone and Android and it takes more or less the same effort and knowledge. the outliers were dos and Windows, and even then it caused loads of issues so much they had y to add multiple layers of checks between signatures, uac, blacklists and defenders because average users cannot be trusted to manage their own systems