ISPs do give enough where I am the issue is usually when you are behind 2 firewalls past that or have VMs that you want to DHCP, things like that.
A real world example my ISP provides /56 at the router level but if you put a firewall behind it, that gets a /64 (cannot be changed). Now the firewall cannot further delegate prefixes since it's already used. Some firewalls allow RA pass-through but in my case this wasn't an option so I had to set up NAT66 (non-standard :/) just to get outbound ipv6 connectivity.
A real world example my ISP provides /56 at the router level but if you put a firewall behind it, that gets a /64 (cannot be changed). Now the firewall cannot further delegate prefixes since it's already used. Some firewalls allow RA pass-through but in my case this wasn't an option so I had to set up NAT66 (non-standard :/) just to get outbound ipv6 connectivity.