Just to give you a bit more info. I am on 20% right now, with 7hrs 3 mins of screen on time. 1 day, 9hrs and 48 mins phone idle. not charging in between.
Before installing my current system I would be lucky to get the day, i would charge my phone every night.
microG has been a blessing, for me everything works (signal, whatsapp, banking apps) just as if i had gapps installed and the battery lasts roughly double.
Just because someone was born in Russia does not make them a specific type of person. Nobody chooses where or when they are born. 7-Zip has been for ages, and if something were to happen to it then im sure one of the dozen of forks around will take the role as the “main one”. However you are right, companies desire something predictable, stable. Which is why some companies like SUSE, Red Hat, etc. Manage to sell FOSS. in fact i believe some of these distros include p7zip, and they freeze it to a specific version, security updates and bug fixes are backported.