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To add a button that doesn't greatly differ from the others, consumes space, but does nothing whatsoever... is an improvement?
Yes. You are not adding a button you are leaving a button there that is on the other pages. Stability in UIs is best and greyed out buttons help users easily understand what is going on without having to think about it.*
* "thinking about it" for basic UI tasks is usually interpreted as usability problems
/me Awaits 'getting ignored by bossman'.
arrowplum-
That's one school of thought.
Another is to simplify interfaces by removing that which you cannot do, to not confuse users by offering options that are not available to them (in whatever the current context is).
It's the difference between a menu that says "These are choices you can make right now", and one that says "These are all the possible choices, but some of them are not available to you right now".
But anyway... I have work to do.
Velocio
To add a button that doesn't greatly differ from the others, consumes space, but does nothing whatsoever... is an improvement?