Why is the middle-click drag limited to vertical drag movements only in the MixConsole windows?

It works really nicely even in the rack area, but only for up-down movements.

Is there a reason why the movement is limited to vertical direction or can it be an improvement?

I hope they improve this too.

This is one of the annoying limitations nobody knows the reason why they exist in Cubase. Like only 4 midi sends and only for a MIDI track. The same limitation is in the score editor. The middle-click drag works for vertical scrolling only.