I don’t see any issue here. I already automate with ACME so rotating certificates on an earlier basis is okay. This should be like breathing for app and service developers and infrastructure teams.
Side note: I wonder how much pressure this puts on providers such as LetsEncrypt, especially with the move to validate IPs. And more specifically IPv6…
Because there are lots of companies, large and small, which haven't gotten that far. Lots of legacy sites/services/applications.
I don't disagree with you that it should be super common. But it's surprisingly not in many businesses. Heck, Okta (nominally a large security company) still sends out notifications every time they change certificates and publishes a copy of their current correct certs in github: https://github.com/okta/okta-pki - How they do the actual rotation? No idea, but... I'd guess it's not automatic with that level of manual notification/involvement. (Happy to be proven wrong though).