Hey, you don't need to convince me play BGT, I'm already playing it and that's not going to change anytime soon.
I just don't see any sense in using it the way it was never meant to be used. Uninstalling it (before or after transition, regardless) is likely to screw up some things for you, I wouldn't recommend it. Actually I wouldn't recommend uninstalling/reinstalling anything on the game in progress, unless you're forced to do it by a serious problem in your game.
So far, there's been no evidence anything will go wrong if you use BGT and IA together, so go for it if you want. Problems brought up by Sikret are of
potential kind, and I suspect they'll remain such. The modified strrefs are for the most part unused remnants from BG1 dialog.tlk. The recommendation to install first has been redundant for some time, as BGT is now widely installed after BG2 Fixpack and several huge BG2 mods.
As for Tutu, there are no install complications if you use EasyTutu. There are reasons why I prefer BGT over Tutu, but more complicated installation on the latter is hardly one of them.