Other issues with Time Machine:

- Very slow, even on an M4.

- 3rd party devices are often unreliable. Not directly Apple's fault, but the lack of certification process hurts

- SMB extensions: In order for an SMB server to support Time Machine, it must support Apple's AAPL extensions to SMB (my understand of this my be a bit uncorrect)

- Network device connecting is separate from Time Machine device connecting. This causes an inconsistent UX.

- Not possible to browse a backup. You can only view file or folder's backup over time. In other words, you can scroll through time but you can't browse a single backup (point in time). This requires using 3rd party tools like BackupLoupe