Can't say why together.jolla.com users would give you negative karma for that, but for XDA it is probably 'Not Invented Here' syndrome, as well as not being open source. If it would be opensourced, I think they would love it and then fork it to a million variations as fast as the cat sneezes.

I'm disappointed to the android launcher situation generally. IMHO they are all copies of the same user paradigm and differing from each other only by the amount of the basic options they offer. There have been some with more idea to them, but those have vanished without reaching any kind of stable status.