Then that would just be skill issue. Not thinking about your lineup and their respective moveset, and then expecting that any fight is possible to beat is just stupid. There's a reason why this game is strategic and that's because you actually need to use your brain.
When your enemies are chosen at random, yes. The rest, which is the majority, already have a chosen lineup ready for you to examine.
I don't really see the problem here, if your bleeders are recharging then just wait patiently.
And no, I'm not talking about the BB3s, I did give a few examples in my previous reply and it seems like you're the one who didn't read it. Not in any rush here, just fooling around in my couch, you can take your time to read all the replies before this. The answer is there, you just need to understand.