The biggest reason for its removal is because the AI ignores Confused units. If the remaining unit on a team was Confused, the AI would just derp around, and the match would go on indefinitely (though obviously at that point you can call one side the winner).
Doku also makes excellent reasons for Confuse being really meh in comparison to other statuses.
Well, so far, one person has PM'd the other 2 of the units, which lets the second person make a pair of units to compliment the first player's. Definitely wouldn't have seen Last Song from me otherwise (also made me sad that Barren's monk had FS Bag instead of H Bag! but it's ok).
I feel like Hidden Knife/Transparent status makes the AI a lot more aggressive -> prefers melee attacks -> less likely to use Head Break. I noticed this a looooooooooong time ago when Hidden Knife first gained Always: Transparent, my ninja went from using Arm Aim a lot to never.
Well, I send my teams on an extended vacation if they're 1. utter garbage (most likely reason) 2. really outdated (a couple of my teams on vacation are from the first few months of FFT Arena) 3. too lazy to revise and team might not be good enough (might be 2nd most likely reason). Reason #2 is kinda like a subset of this reason haha
Speaking of revisions though, Do Not Disturb has had 3 drastically different forms - different enough to be considered different teams. I guess I liked the name =P The first version would be completely outdated though at this point.