Not to thrilled with even more changes to Thunar's UI. I always liked the clean look it has. That said, I'm glad they've fixed the file transfer issue as I pull up the CLI for large copies because of the file copy window stealing focus (and sometimes seeming to freeze). Glad about the performance tweaks all round! As for panel, it is seriously long overdue being able to remove items more easily so hallelujah to deleting multiple items! And I am excited we're entering Wayland territory as I've been getting worried that XFCE would end up lagging behind, so glad there's actual functionality (albeit limited/experimental). All in all, I'm both happy and relieved, and if my only gripe is going to be Thunar's UI being a little cluttered, then it's a small price to pay for every other improvement!
Can't wait to give it a shot when it's backported, or in testing.