Yeah I still do this. I have a cronjob on one of my servers that runs every five minutes, checks if the upstream DNS IP matches my public IP and, if not, sets it. Adding 60s TTL, this means an average downtime of 3 minutes per change, max 6 minutes.

It’s also possible to use different nameservers than the one the registrar provides, in case the registrar doesn’t have a proper API for DNS.