You argued before that middle click has no use, bow you shifted to saying it has no use for textfields, but that is also not acurate. In many OSes this does stuff related to selecting tect, not replacing it.
One major feature that is also expected with middle click is “autoscroll” which firefox for example disables on linux only because it conflicts with pasting stuff into the textbox.
There is no conflict free way to do this feature, honestly.
I am award of the destinction. But this is only in the design of X, in reality some clients support only ctrl+v and some only middle click, and some only a different shortcut. Some clients change both buffers and others only some. This all makes it incredibly confusing to users and basically unusable to anyone except power users.
I don’t really see the point of adding this by default seeing as we can’t do this conflict free and it adds way more confusion to users.
But again, if you want to do this with shortcuts on your install you should be able to. (should be in the sense of the design should accomodate this, not that it does currently)