The comment in the thread you linked directly contradicts the claim that "bootloader unlocking will also go away".
Because Google-free AOSP-derived Android distributions are far more versatile, offer far more freedom, impose far fewer restrictions and tend to end up being far less expensive than whatever the fruit factory decides their dedicants have to use today. If Google goes the way of the fruit folks and AOSP no longer offers these freedoms the next step is not to surrender to the Church of Apple but to find a way to evade those restrictions.
Can you download, build, and install a basic Android system these days without touching a single piece of closed code? Absolutely. Will it be able to do much without closed binaries? No.
Android isn't GNU/Linux where there's a general ethos of making everything in userland FOSS if at all possible. Rather, it's a free OS that both Google and manufacturers can do anything they want with, including shove a ton of spy and bloatware on it, then make it to where you can't get rid of those things, at least not easily.
The optimism from 15 years ago surrounding FOSS in the mobile space is on its deathbed.
Is it really doing anyone in FLOSS any favors if the projects are legally open but not practically?
I feel rooked on Android tbh. If the idea was to give large companies a free way to manage the hardware resources in SKUs that are competitors to the iPhone, yeah, it definitely accomplished that, but that makes it only a means to an end. It's not like GNU/Linux where there's any ethos to seriously change how software and services are delivered.
iOS does a tremendous amount of data collection including for the usage of ads as per Apple's privacy policy. All the same types of data that stock Android collects, even.
You may believe Apple is a generally better steward of that data than Google, but using iOS does not reduce the amount of data being hoovered up in any meaningful capacity.
> Now there's also no more sideloading, so what purpose does Android even serve anymore?
I hate this change, but I still prefer Android. iOS is hardly perfect nor does it do everything better...
GrapheneOS won't survive the next generation of devices because bootloader unlocking will also go away (https://www.hackerneue.com/item?id=44765939), and without kernel security updates that OS can't continue.
Now there's also no more sideloading, so what purpose does Android even serve anymore?