Meh, scratching it in your back with a pointy stick is probably a much worse place.
It is not a bus definition. It an “Alias List”, and it is not a part of any specific bus. The alias list can be used to add signals to busses with different names, and on different sheets of the same project. This alias list, and naming of buses themselves is also a relatively new feature. Up to KiCad V5 (I think) the blue bus lines were only graphical eye candy and the bus connections relied solely on labels. And the functionality may well be extended in the future. For example have a look at these “pin Helpers” which are coming in KiCad V8 (expected end of February): Post-v7 new features and development news - #31 by mikebwilliams
But there is at least some merit to your line of thought. There are several dialogs in KiCad that can be opened from multiple places. For example, selecting a symbol, then pressing e and pressing the Change Symbol button, opens the same dialog as Schematic Editor / Edit / Change Symbols. In the same manner, a button could be added to the labels as a direct shortcut to open Schematic Editor / File / Schematic Setup / Bus Alias Definitions. I think I like that Idea, because that makes this alias list easier to discover for beginners and people who do not read the manual.
Indeed, no point in complaining, but constructive criticism is welcome.
KiCad is just a bunch of bits and bytes. And though there are many of them, they are lightweight and easily digestible. But be careful, depending on the media type you use during consummation it may be a cause of a heavy stool or even constipation.