Being a furball type, I am not familiar with the typical mission, but I frequently see successful CV invasions on the other maps (like Compello). Are you saying that these no longer occured on Trinity? If not, perhaps the majority of Trinity players were happy with the existing Trinity game play, and the small group of 10 or so Forum posters complaining about the map were not typical.
BTW, the spawn fights were fun; leave them in. TT is just an additional option, and with the center VBase added, can be busy again.
MH.
I'm a fighter guy too. I use to do lots of missions, back where you could count on a fight being there. Now very few defend, and base attacks are smash a grabs. Should a defense pop up the attackers disappear.... eeerr die

and move someplace else for easy pickin's and to avoid fighting for the base. Cv attacks are much the same all or nothing. If they don't get it before the line of dive bombing lancs sink the CV the attack moves on. Trinity only had a few CVs and they took forever to move into position. So once they were sunk CV ops were done for the night.
The spawn fight may have been fun, but it is what kills TT. You can only have a limited number of tanks at those spawn points (10 guys shooting at the same spawning tank each time Woo whoo!

Move more than double the numbers to TT and you have a much better chance of finding spots to shot from to get some action. Look at the TT on the NDisles map. It is much the same as the one on Trinity so I would expect the same type of fights.... if you can get the people there.
I have no idea why Trinity was removed. I highly doubt it was because 10 people kept crying on the BBS about it. I do know when ever that map was up you could count on at least one new thread to start and quickly load up with posts about having the "stinkin Trinity map again!" Maybe HTC observed number drops in players when that map was up, maybe HTC decided it was no longer "fair" for the game play style that is in the Mains these days. Who knows...... well HTC knows

but for what ever reason it was removed.