https://arstechnica.com/gadgets/2014/07/exploring-the-world-of-foss-android-can-a-smartphone-be-open-source/
The great Ars experiment—free and open source software on a smartphone?! | Ars Technica / @ronamadeo
"(...) All-FOSS Android is possible, but you're going to make a lot of tradeoffs (...)"
I came across that near-decade-old, only 'Further reading' link from this Wikipedia page on F-Droid: https://en.m.wikipedia.org/wiki/F-Droid
So... where do we stand today? What's the best free-as-in-speech software stack for an #Android phone?