@vkc
In general, being consistent, following standards and conforming to peoples expectations is more important than being optimal, in any sense.

A great example is car control layout. The current two (or three) pedals and wheel layout can probably be improved. But not improved enough that it's worth disrupting the training and muscle memory of a billion people.

Basic desktop controls are the same. Being consistent across all desktops is better than being optimal.

@vkc
I've used Linux since 1995. I use it personally for fun, and I've used it professionally for 30 years, incuding some of the largest computers on earth. And I've used middle-click for that entire time.

I love using Gnome, *because* it doesn't overwhelm me with options. It gets out of the way. And I think removing middle-click is the right decision. The utility just isn't worth the confusion - two clipboards and accidental middle-clicks still confuse me.