It is self-evidently not correct that companies that can't keep DNSSEC running can't keep certs running. Entire TLDs have fallen off the Internet because DNSSEC has broken. A certificate never took Slack down for half a day. It's just obviously not true.
It's amazing what practice and investment can do, even for a fragile system like X.509. Yet certs still break constantly. Like permanently killing people's "perpetual" Microsoft Word licenses in a story posted within hours of this one.