Agree with that!

I never used the insert key much, as it is really missing (or hidden at some function key level) on half of the keyboards I use.

Once you are a slightly advanced user, middle-click-paste is a pretty essential feature, as the Ctrl-v combo doesn’t work in a terminal.
So removing that default feature might appeal a little bit to some of the newcomers, but potentially makes life harder for them in the mid- to long run.

I think you can use it for side-scrolling or page-moving(???) or so.
Somewhat exotic, I don’t think I know anyone who uses the middle button for anything other than the standard mouse-wheel vertical scrolling, which has nothing to do with pressing the middle button.

which tends to overwrite the paste buffer

Isn’t it a different buffer?

At least on my KDE system I can use Ctrl-C and select-middle-mouse in parallel without them overwriting each other.

So just give apps an easy option to override the system default.
No need to change the established and pretty much standardized default behaviour of the whole OS.

So… what does a Windows user expect?
Isn’t there just no standard behaviour at all?

And I always had in mind that Macs only used two mouse buttons. Has that changed?

WTF?

And the reason is bullshit.
User confusion… You maybe get confused once or twice, after that you just start using it as it is incredibly convenient.

Only confusion happens when I have to use Windows and it doesn’t work any more…