we use RFC6598 addressing and CGNAT on the edge unless someone pays for an IP.  Very slowly getting IPv6 implementation down.  Poor CRM/Shaper support for it being a big struggle.  Preseem+UISP for example requires that whatever is handling IPv6 PD be pollable from preseem so they can grab MAC:PD prefix and combine them.  VISP has implemented this better recently but I haven't fully implemented yet, that's a goal for this month.

We don't 'tunnel' ie no MPLS/VPLS, SRV6, EVPN right now.  We technically do GRE tunneling, terragraph works just like OSPFv3 on IPv6 w/ GRE tunnels.  

Part of the reason not to tunnel is that we don't have a single headend, we have regional POPs and interconnections between so we can reduce outages caused by the POPs.  Fully routed seems to only non-convoluted way to handle this.  Not interested in a VRRP moving my tunnel endpoint addresses between regions, that's a mess.  And so we route.