Stop mistaking your unique desires for those of the vast majority of smartphone users. Very few care about alternate push notification services, or sideloading, they are happy to use the default app stores and services.
Even with the restrictions in place, Facebook and other apps have been caught abusing privileges to get more CPU rights and burn up battery life (and get collect user information).
https://cheapskatesguide.org/articles/techno-cage.html
There has to be space for more. General purpose computing getting snuffed out under the new security regime is accepting the abyss, & we must strive for more.
Except since our community actually knows stuff & we have users interests at hearts & it's open source, places like Debian would be largely immune to most of the horseshit.
I truly hope Pine phone picks up share (and performance/ functionality) so people who want this level of control over what their phone runs have a platform.
A lot of people don't know how to manage their phones. I know how to manage performance on my computer but would prefer to not have to do the same on my phone. I suspect I'm not the only computer professional who wants to leave that sort of administrative detail to their work life and not have to deal with a phone that crashes due to a poorly written app.
I suspect this is why the iPad is so popular. It has much of the power people expect from a PC, but removes much of the headaches associated with them.
My feeling here is there is space for managed platforms such as the phone and the iPad; less managed platforms like the Windows/ MacOS; and truly open platforms like Linux. I'm not sure open platforms are very well suited to phones myself, but I'm not against them either.
There are bad actors abound but many users were navigating the environment semi-ok, checking for information on how bad their apps were acting.
The clampdown is both for the user but also enormously user hostile. We can try to pin down how justified or not it is, but it bloody sucks either way & I am worried, really worried, with current events like Mozilla & Apple teaming up to decry webmidi & ambient light sensing as enemies. Yes they have some risk? But mostly this comes off as farce to me, & spun with heavy marketing "be afraid" FUD.