Yes it’s optional.
You should be aware that some function depend on fuse and are not longer available when not using it.
Like the custom mount point option.
Further more, WebDAV itself can only handle files up to 4GB size. So when using WebDAV as connector, you can only store files up to 4GB size in your vault.
Im not sure if it’s the same on Mac, but on windows there’s another WebDAV „speciality“.
The network drive that is created will be shown with the capacity of the system partition, although there’s more free space where your vault actual lies.