Definitely agreed, longer software support would be nice. On the other hand the repairability is important too, if you can replace battery and fix a broken screen easily the phone is unlikely to be useful after that many years anyway.

I think the previous pixels were reasonably good in that regard (not compared to framework of course).

Improving that would be higher priority in my eyes. Software support can always come later: even once the official support is dropped the community can backport AOSP fixes etc.