Description
We have some support for propagating metadata, but it is incomplete (38 xfails in tests/generic/test_finalize.py) for plain methods and has no real prospect for getting robust support for concat/merge etc.
At the same time, there is a real performance cost to calling __finalize__ everywhere, in an extreme case like #46505 these calls take up a quarter of the runtime.
AFAICT this is useful for a fraction of users and perf-hurting for everyone else. Do we have any idea how common it is to rely on these?