I would have agreed if they hadn't put in the engineering effort to upgrade the backup disk image to APFS instead of HFS+. They wouldn't have done that if the plan was to deprecate it soon. (IIRC the next version of macOS is also dropping HFS+ support)

Also it's honestly really weird that they don't have iCloud backups for Macs yet. It seems like a no-brainer feature. I know I would easily switch to Apple over Backblaze as Backblaze's client is just terrible.