Is that really a thing, with HNers of all people? You just use your registrar's/nameserver operator's web tool to point your DNS name to a new IP. Transferring your DNS to a new registrar might be a bit more involved but is guaranteed to be also possible by domain market regulation. Or maybe it is a problem of cache invalidation and/or lack of control over exact timing of DNS switchover? Or, idk, possibly Google-owned TLDs like .dev require Google Domains as registrar? Or does Google Domains (or GoDaddy or other big registrar) make transferring your domain difficult in a dark pattern way? Doubt it though, if even changing pointed to IPs appears difficult, which however shouldn't be something a registrar would have an interest in making difficult.

Now I have to go check and see if it's not caching our fonts. Geez, I just assumed...

> fear of changing DNS settings

I recently had to migrate DNS to Cloudflare to stop a 40,000 QPS DDoS attack. DNS migration was slow, but painless. As long as you plan accordingly and set up the new destination in advance, it should be fine. Hosting DNS at a DNS provider will give you extra flexibility in the future.