It's frustrating that even brand new Unifi devices that claim to support IPv6 are actually pretty broken when you try to use it. So 10 years from right now even, unless they can software patch it upwards.
Prefix delegation is completely broken for example
I had to switch to OpenWRT on my Ubiquity gear to have something that works (which on the other hand is also easier to configure, so I'm probably going to stay there).