Stuff like this is why some parties have been calling for increasingly-shorter cert validity. When a cert is valid for several years it allows companies to develop an increasingly complex workflow around deploying them, sometimes taking weeks and involving dozens of parties to roll them out. This is in turn used as an excuse by CAs to completely ignore the industry standards.
Those SaaS vendors probably shouldn't be doing cert pinning to begin with. If you don't trust your root store either implement support for CAA or DANE, no need to roll out your own workflow. Those hardware devices should either 1) not use publicly trusted certs, 2) renew their own certs, or 3) have an API to automatically update certs.
The only reason they're still getting away with it is because doing it manually once a year isn't horribly painful. If 90-day validity becomes the industry standard, pain-free certificate renewal turns into a must-have for all new contracts.
Those SaaS vendors probably shouldn't be doing cert pinning to begin with. If you don't trust your root store either implement support for CAA or DANE, no need to roll out your own workflow. Those hardware devices should either 1) not use publicly trusted certs, 2) renew their own certs, or 3) have an API to automatically update certs.
The only reason they're still getting away with it is because doing it manually once a year isn't horribly painful. If 90-day validity becomes the industry standard, pain-free certificate renewal turns into a must-have for all new contracts.