"outdated certificate data" would be domains you no longer control. (Example would be a customer no longer points a DNS record at some service provider or domains that have changed ownership).

In the case of OV/EV certificates, it could also include the organisation's legal name, country/locality, registration number, etc.

Forcing people to change passwords increases the likelihood that they pick simpler, algorithmic password so they can remember them more easily, reducing security. That's not an issue with certificates/private keys.

Shorter lifetimes on certs is a net benefit. 47 days seems like a reasonable balance between not having bad certs stick around for too long and having enough time to fix issues when you detect that automatic renewal fails.

The fact that it encourages people to prioritise implementing automated renewals is also a good thing, but I understand that it's frustrating for those with bad software/hardware vendors.