People that think this is unacceptable are not remotely average users. Average users benefit greatly from their pocket appliance not being a full fledged computer.
In what way? Seriously, what benefit is there? (And don't say security...)
> you have been infected by 3 viruses, click here in the next 5 minutes or the damage will be permanent
And they believe it. Giving them the power to run any software they want, also means giving everyone else the power to make them run any software they can be tricked into installing.
I'm deeply concerned about how this will impact users like us, especially since we're such a small minority that our desires could easily be trampled by the masses, but this is a clear win for the average user.
(And don't make the perfectionist fallacy w.r.t. Google not successfully preventing 100% of malware)
Two reasons: they are not educated about devices they use, desktop operating systems are still awful at security (exe from a mail attachment can have a pdf looking thumbnail, executed with two clicks, even if accidental, immediately gets access to all user files... the whole concept of antivirus software...). It has nothing to do with side loading, especially on Android, where sideloading is a very explicit action already, and then you need to allow the application to do harm.
> Giving them the power to run any software they want, also means giving everyone else the power to make them run any software they can be tricked into installing.
You are taking away people's agency. Either you get to control your bank account risking that you get scammed, or someone will control it for you.