2013/9/13 Aleksey Midenkov <midenok@gmail.com>
I watch over Trinity project for as long as 3 years. I want to give my
grade on its development activity. I think that the project is not
capable of public use and rather suited for small group of inside
hackers.
Strictly speaking, this is not true I've talked to a couple people who are using trinity and not subscribed to the developer mail list ;-)
Although I'm not sure if there are any other such people anywhere...

Along the history of development there were too much lame
unprofessional decisions. It was fulfilling some strange unpractical
ideas. In fact, it came to a logical unsuccessful end.
I believe you are speaking about qt3 API breakage. If so, I'm totally agree with you... IMO that was really crappy choice independently of reasons. I can name some other controversial moments but they are relatively small... 

If you install 3.5.13 you will get too much trouble. I think, that
implementing all the missing features into KDE4 is less cost, than
waiting when this woe project will get to a decent condition.
I've got the same thoughts sometimes: to port kicker, kdesktop and keramik style to kde4 and there will be no need in trinity. I've even tried to start several times to port kicker and keramik... But all this have gone nowhere...

On the other side: even if we won't take into an account the fact that all this would require numerous of efforts, and if we will be able to push our patches to kde upstream, anyway we can't do anything about performance issue of kde/qt 4/5. Sad but true.