Comment by zamadatix

A good compromise between this (lots of routing work on the internet) and random prefixes all the time (lots of work on the end user networks) is setting DHCP-PD to do consistent PD assignments. Sure, you're space isn't portable between carriers if you move/have redundant internet but you can also rely on a static address in your assigned range working 3 years from now even if your router is offline for a month. ATT fiber does this. I haven't done a survey of who else.