We had a FO-Ex in our platoons, and I was a bit surprised at that. But it's the new norm really. Fortunately no other part of the game penalizes you for not having a specific unit, save for maybe Hero's Journeys now.
But the one that really annoyed me was the need for 8 DTs and 6 Shores in yesterday's phase, when there is a combat that requires Veers/Snow, with Veers locked as leader. There were a bunch of Magmas and Storms as well but at least no one was sad to part with them.
I'm happy that at least the first 3 stages of TBs are pretty much gimmick-free.