I find it hard to universally recommend LineageOS because it can be a true 'your mileage may vary' situation depending what you use it for, which is fair enough

I find it hard to universally recommend LineageOS because it can be a true 'your mileage may vary' situation depending what you use it for, which is fair enough for the fruits of a volunteer project. It's great if your aim is to get an old phone on a more recent release, but as they're not pretending that they're official firmware some apps won't work with that if they want the integrity check. Those apps can be broadly useful, and the whole reason you're updating in the first place.