Reason for disabling IVP6
That it punches thru NAT routers enabling all your little goodies behind them as directly accessible.
MS even supplies tunneling (Ivp4 to Ivp6) so if using Linux in a VM on a MS system you may still have it anyway.
NAT was always recommended to be used in hardening your system, I prefer to keep all my idIoT devices behind one.
As they are just Idiot devices.
In future I will need a NAT that acts as a DNS and offers some sort of solution to keeping Ivp4.