I honestly found little use for manual TB aside from stealth-stealing, and traps.
So I have been vocal how I dislike how only some characters turn combat - so I thought I will manually initiate turn based before striking and than it will work normally, right? After all, all my characters are already in TB mode.
Nooope, the character who attacked joined combat, while the others
were kicked out of manual TB into real time. They were still chained, because of course they were, so when I switched to one of the character outside combat instance two remaining companions happily strolled across the battlefield entering combat and loosing entire turn.
Just ughhhh.