Why was it removed?
TR (for what I know) was removed because people started botting a bot through TR tag and that bot destroyed a whole server. In response to this, Mistik decided to remove TR tag entirely because we "don't need training anymore." Instead of this why don't we just remove bots from TR tag or make separate bots on TR tag like the viruses. There are plenty of work-a-rounds. Of course, none of this has to do with a counterpoint to add it back in the first place.
Why do I (and probably other people) want it back?
TR tag, like the 'formal' name implies, is meant for training. In the past, if you sucked at a certain trick, you'd do 1 of 2 things. 1. deal with it and try it in normal gameplay or 2. Pop onto TR tag and play without restriction. I was a person of number 2. And although that example might sound dumb for practicing doubles, triples, pres, and other splits of the sort, TR tag was amazing for practicing splitrunning or realtiming. Without TR tag messing up sadly means some dude is just gonna double on your dead mass, but in contrast messing up in TR isn't as bad. Another benefit to TR is that 2 people can have a fair 1v1 or practice teaming.
Like this post and leave a comment with other suggestions on this topic to let Mistik know we want this back. If you disagree with this idea, please state why in the comments.