How is the ipv6 situation these days? I left Ubiquiti 2 years ago because I needed to be able to configure the /56 I got from my isp. The unifi controller was pathetic in what it could do.

I'm new to Ubiquiti routers, but I had no problem dividing the /60 I got from my ISP and assign /64s to VLANs.

You might be interested in https://www.youtube.com/watch?v=KZpJvpm1Ris (title: Does UniFi FINALLY support IPv6 Properly? State of IPv6 with Unifi Network v9). The video is about a year old, but from the looks it's not terribly outdated.