It's actually not funny when someone gets caught updating to Catalina, a bunch of apps that worked fine yesterday now no longer work and it's not really obvious why.I think Craig Federighi should have called each and every Mac user personally ;D
But since you mentioned "personal" notification....
I get an email from Apple about once a week trying to sell me something - Apple has contact info of anyone who ever used the Apple Store for anything, they could have sent out an email that would have covered a large portion of their installed base.
Anyway - water under the bridge.
Just an indication how the customer-centric approach Apple had is changing.