You know you could monitor your certs to verify that your client is functioning correctly. There's also notification emails if you provide your email address at issuance time.
This is not super friendly either because even if you identify an issue early there are many rabbit holes of failure, ratelimiting, and tool integration, that make it a PITA to deal with.
Being good at catching errors doesn't soften the blow of the errors being so readily occurring in the first place.
The parent stated that you can run your own DNS server temporarily for the cost of the hardware to run the server and shut the DNS server off after the certificate has been issued. The cost is basically free.
Can you give some more insight on what happened to the team managing openssl during that time? I remember being on-call at a job when the news dropped.