Bloating and Obsolete are two different things, bloating tend to happen because you install additional software and that’s sub systems are also installed (Like TrainerRoad install Electron on Windows devices), and these take up system resources, Obsolete, is more that the manufacturer doesn’t release software updates, my Fenix 6 won’t get as many (or any) updates, now that the Fenix 7 is released, but the lack of software updates doesn’t make it obsolete, my 820 doesn’t receive updates, but it still works fine as GPS (well, works fine is a bit of a stretch, it’s a 820) and will continue to do so for a long time
Karoo updates work on the 1 & 2, so it’ isn’t really comparible to Samsung e.t.c, where they are interested in getting you to the next phone, for older devices is sort of pulled, so newer software won’t work on older devices