To me, the difference here is that - while all of those earlier changes were organic; that is, individual members chose to leave - in this case it appears that Neil has decided to force a change for change's sake.
It occurred to me that, while rationally there is no reason why this would not be a legitimate move - I'd have accepted it more willingly had Mark chosen to leave - it comes down to my own view of what constitutes Crowded House. For the first three albums, it had a core of three members. When Paul chose to leave, in my mind the core three-man membership changed but remained a three-man core.
It would seem that, in Neil's mind, it didn't. It became a two-man core. That would also explain why he was happy for Time on Earth to be branded as a CH record (although it doesn't explain why it wasn't considered as such from the get-go and only became a CH album when Neil decided to reform the band by inviting Mark back!). Of course, Neil is human and can change his mind or hold contradictory views.
My only frustration in all of this is that it seems to take us ever further away from Neil's original intention of being respectful to the legacy of the band as it had been at the time it was first dissolved. Otherwise, Neil might as well have kept the name on for all his post-TA work.