Earlier quoted context omitted.
I think what is missing here is the growing trend of scammers convincing people they are their bank (or whatever) and walking them through enabling side-loading and then installing malware (sometimes to address some urgent security issues with their account). This is meant to counter an actual issues that is affecting many many users.
> This is meant to counter an actual issues that is affecting many many users. No, that's an excuse. Google just wants a tighter grip on their software chain, which is understandable if they were Apple but they're not.
This is not simply an excuse. Android phones are prevalent in countries where smartphones offer the only realistic access to banking and cashless payments to the majority of the population. Scamming schemes targeting those users are also very frequent in many, if not most of these countries, and educating people about them is hard. Like it or not, this change is likely going to be a net positive for many people.