Andreas,
If you would, please, I'd very much appreciate it.
I plan to buy BTT (lifetime) anyway, I think - especially after watching 'reviews' like this 
.
I chose the MX Master 3S because it seemed to be ergonomically and 'electronically' superior to anything else. I really only use scroll and right-click which are 'extra' to the standard mouse operations.
At this point (with a brand new Studio, Magic keyboard and Magic Trackpad) I'm no longer wedded to the Logitech… that is today: if there is a better mouse - especially one that already has wider integration with BTT - I'd definitely consider it!
Thank you again, Andreas!