An end-user doesn't want to manually update a domain each time they update their site. That's practically a non-starter for the technology. Especially since domain updates require transactions (on a L1 or L2 chain) to complete.

As mentioned by another person, IPNS does solve this issue, though. My domains are pointed to an IPFS+IPNS-published version of my site, which is re-published on change from Github.