I appreciate the passion. As discussed in the topic above, this needs to be the default in order to get energy-consumption certifications — and that makes sense to me, as idle devices doing nothing really add up. So, we can do our part.
GNOME suspends after 15 minutes of user inactivity, even on AC power describes how you can change this for systems where you want a different behavior. I do agree that we should have easier login screen / lock screen configuration — we’ll talk to GNOME upstream about how to best provide that.
Note that processes can request for suspend to be inhibited, and that should happen automatically when applying updates via GNOME Software. If that didn’t happen, that’s a bug.