Thought I'd conduct a little test between a tubed and non tubed 35 psi Mac50 rear.
For some reason, I always thought I got about 13,000 k's out of my first Mac50, which was run tubeless.
Subsequent Macs (15 or so) have only ever returned 6,500 - 8,000k's.
So I finally managed to get a Mac50 rear mounted tubeless again. The result was a 7,000 k tyre.
In my case as good as no tyre wear difference, tube or no tube.
I now have a tubeless Michelin Pilot Active on the rear as the Mac50 is nla. I hope it lasts longer as claimed.
First corner I went around I found the bike to almost fall into the corner

I didn't think a rear could influence the bike like that, it sure feels/felt different!
After the weekend excursion in the mountains, all feels normal again.