I've been native IPv6 at home for a few years now. That worked flawlessly until a recent Windows 11 update somehow broke IPv6 in ways that I don't entirely understand. All the other Linux and Apple and et cetera things in my house are fine, but the Win11 laptop just refuses to handle certain IPv6 ranges (specifically including the address that the host interface for one of my web servers falls in). 100% contained within the Win11 device and TBH I can't be bothered to dig into it further so I just proxy through some other device that does work. (Guessing it'll get fixed a month/year/decade or so from now.)

I agree it's not a failure, but after 3 decades it's still frustratingly annoying to use at times.