Automated issuance is on our roadmap and ACME/Certbot support is something we'd like to do if possible. We still have some prequisites we need to sort out first (like proper subscription billing) but the idea is solid. ACME would be preferable over a custom automatic renewal mechanism since theoretically it would allow existing clients to get and renew EV certs automatically but we'll have to start actually hacking it to see.
You still need to reconfirm identity before the new cert is issued. E.g., we have a lot of startups as customers and they often forget to pay a bill, and are no longer an active entity according to their Secretary of State (we flag this up before payment). So it wouldn't ever be entirely automated but that doesn't meant we can't do automated renewal: ACME tries to renew repeatedly a month before the cert expired and we can block until identity is reconfirmed.
The country, and TLD, and type-of-business (active registered company, DBA, sole prop, onion), and other logic (detecting inconsistencies between data sources, determining if whois privacy is in use, etc) are implemented and documented in source code - CertSimple itself is an engine to meet those rules and handle those exceptions.
You still need to reconfirm identity before the new cert is issued. E.g., we have a lot of startups as customers and they often forget to pay a bill, and are no longer an active entity according to their Secretary of State (we flag this up before payment). So it wouldn't ever be entirely automated but that doesn't meant we can't do automated renewal: ACME tries to renew repeatedly a month before the cert expired and we can block until identity is reconfirmed.