Yeah, this is exactly the sort of thing I'm talking about. Lots of additional overhead and work, and — again, speaking as a home user — no apparent benefits for dealing with it all.

I get all the concerns about CGNAT and so on, but that's something for the ISP to figure out. If I get a message one day saying that my connection speed is about to drop 30% because of my insistence on IPv4, I will of course react!

The question for me is not, "why would I block it?" but instead, "why would I enable it?". There needs to be a reason, and right now I'm not seeing it.