[jeroenhd]

> npt doesn’t solve things because prefix lengths are variable

Then you pick your shortest prefix length and use that for your network configuration, no? Nothing in NPT is forcing you to use a /48 or a /56, if your failover uplink only provides you with a /80 for some stupid reason you'll still be able to do translation.

DHCPv6 is supported just fine by everything but Android (for some annoying reason). Even with SLAAC, IP addresses shouldn't rotate, unless you enable Privacy Extensions on your server.

If this were the bakery just around the corner we're talking about, I would've accepted these problems as illogical to even try to overcome, but these are billion dollar companies selling network access. When networking is one of your major streams of revenue, I expect better.