Hi,
You personally may think a map is good. However there is a lot more that goes into it. Obviously how does it effect the performance, lag. Is there enough room for this and that. Is it to small is it to big. SMT Denied it once, and they will keep denying it. Matthew has stated that SMT has there reasons why, and if there was nothing wrong with Truenorth and tons of players wanted it, I'm sure they would go back. Obviously SMT's main goal is to make the server run smooth, while keeping the players happy. But every person has there own opinion and there's not physically way to make every single Gaminglight player happy.
Just keep in mind:
-Performance
-Lag
Are probably a couple main reasons. There could be more, which idk.
(This is just my insight on it)