maybe if the majority of devs switched to jj or something similar your idea might become semi-common. but it seems to me that currently for most most project, it generates a lot of cost for very little gain.

My personal idea is that the code in each PR should be well documented enough for a review, but also for when people join the team and need to learn. Or when a pour soul needs to check upon your code while you are out on a holiday. This personal rule does not apply to all projects, but for bread and butter stuff I tend to go by it and not care about clean commit histories. The cost to reward seems way better.