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From my point of view is redundant to add all versions of a website URL like:
example.com
www.example.com
http://www.example.com
http://example.com
https://www.example.com
https://example.com
My website is going to be exclusively accessible at https://www.example.com and all redirects and other adjustments will be towards this.
It makes completely no sense for me to monitor all those property versions.
Registering the non-canonical properties allow you to check/diagnose configuration errors. For example, if a canonical redirect should fail (or be incorrectly implemented) for whatever reason or SSL cert renewal failures and/or pages aren't being indexed on the canonical property, you have no way of knowing (without doing a less reliable site: search) whether those pages have been incorrectly indexed on a non-canonical property by mistake.
example.com www.example.com http://www.example.com http://example.com https://www.example.com https://example.com
That's 4 properties (not 6), the first two are the same as the second two.
Note that you can also add a domain property which aggregates all variations (all subdomains, all protocols) under a single property. You can then "add a page filter in the Performance report to see data for specific protocols or subdomains".
