I personally run Pop! on a thinkpad for school and its rock solid. I’ve rebooted it maybe 10 times over the past 2 years, mostly when it ran out of battery in my backpack. I’ve never had any issue with it, I even installed KDE in addition to the standard GNOME and it worked just fine. If you’ve liked Pop! so far, I absolutely recommend it if it works on a non-System76 machine for you.