Actually, I wish Microsoft would stop referring to replication when asked about backup. It's the modern way of saying "You probably don't need backup, because you have RAID". There's a reason Azure SQL Database has self-service point-in-time-recovery despite also having replication.

Do you see many use cases where there is no need for backup to protect against accidental deletion, overwriting, deletion by application vulnerabilities and so on?

As far as I understood the backup docs, I should contact Microsoft Support within 8 hours if any of those things happens. Is that still correct? What if we don't notice the issue until 7 days later?