Calibre is Kovid's project.
If he wants to use Launchpad, that is his choice. Just like it may be your choice NOT to contribute because you don't like his choice.
Offering up a newish alternate was fine.
It has been rejected.. He does not have to give anyone reasons.
It is a PITA to work from 2 streams. I don't find any
fault with rejecting that choice.
We all have our favorite tools. You have been given submission alternates. Having lots of active developers is
, but they must follow the leader to be successful.