Wouldn’t this lead to intense efforts to install malware and scams?
Just picturing wanting to sit down and play on my PS4 and having to first run virus and malware checkers.
Just picturing buying a computing device, then not being able to install the software I want on it.
The status quo is then when you buy console devices e.g. gaming, cars, TVs etc you can only install apps that are approved by the manufacturer.
People think of phones as console devices not computers.
Why would a reputable game developer ever release malware? You can still go to a reputable developer's website or even Sony's website and obtain the game from their store and be guaranteed that it's free from malware.
Of course, if you're obtaining your games from Torrent-Warez-1337.net then you need to be more careful but then it's your fault, it's not like you didn't know what you were in for when you went to a shady website.
https://www.cnet.com/news/just-as-critics-feared-fortnite-fo...
(And the platforms that don't have effective sandboxing need to implement it, regardless of whether they allow outside apps or not).