First time, eh? I remeber namecheap had problems 10 years ago when they upgraded interface and something was wrong with dns srv records. So i had to move out to gandi at time
eh, you can just add search domain via dhcp or static configuration and just type out http://mything/ no need to enter whole domain unless you need todo ssl
As previous owner of Archer C7, Archer AX23 barely upgrade if you want to install additional packages as it have same 16/128 flash/memory configuration just like C7.
Personally I upgraded to xiaomi Router AX3200 with 128/256 flash memory configuration and 4:4 MIMO, though it lacks USB and have WAN+3LAN ports compare to usual WAN+4LAN.
residential - not many. Corporate on other hand is different story, thus why happy eyeballs for transport still would needed to gradual rollout anyway.
SCTP works fine on internet, as long your egress is comming from public IP and you don't perform NAT. So in case IPv6 its non issue at all unless you sit behind middle boxes.
Asssited GPS[1] solved that exactly problem, since not network connected GPS devices need download GPS almanac and ephemerides via GPS 50bits/s connection, which can take a while.
I actually did same just couple months ago, 980ti->3070. Though TDP claimed to be 220 but depend on vendor it seem it can peak to 250. Also one thing i liked after upgrade that 3070 have fan off when you aren't have load on it like desktop apps.