>>106154729
>(don't know which genius it was that thought it was a good idea to use : in ip6 when : is also used to separate the port number, so then you have to wrap the ip in [] but it's not guaranteed to always be there if ip6 is a string so you also have to account for when neither brackets nor port number exists)
Wait till you get to use link-locals and their percentage sign. That crap often breaks syntax in config files or other types of inputs.
>>106152770
>sharing of ip4 addresses
First, you "share" addresses - or subnets rather - on v6 too. Second there's loads of fixed broadband users with practically a static IPv4 address.
Personally not seeing much difference it that regard.
>>106150322
>advertising its own IPv6 address as DNS server
You mean the DHCP reply?
Either configure the PiHole IP manually on your devices or reconfigure the DHCP reply (if your router allows it). Not sure what's the fuss here.
>fe80::1
No percentage sign followed by an interface ID? Doesn't look right. Should look something like "fe80::%1"

>>106128954
Yes, link-locals are beneficial even without IPv6-internets, I use them every time there's a chance.
And obviously you want to use IPv6 case your ISP provides it.