Please use a personal email. My email is ‘mail’ @ ‘my actual name’. It does not get more personal than that

It’s a legit rule they’re enforcing, IMO. Generic email addresses are usually unmonitored mailboxes that don’t bounce. Easy to use if you’re spamming contact forms and stuff like that.

Instead they advised me (3 times) to create a personal email on a service like Yahoo, Outlook, Gmail, Orange, etc

I think this is more a boilerplate suggestion, to lower the barrier to entry for people. Gotta remember, those of us that host our own email and/or use our own personal domains are definitely in the minority.