Yep, this is the mantra I ref by, as long as you aren't giving tons of cheap cards (I consider dissent, FRD, DR to be cheap. Not that they shouldn't be given, but just don't have a mountain of those). UB variety challenges should mostly be given at all times and warning those clear ones instead is how to lose control of a game. Hell, earlier this month I gave a player a DOGSO red in a preseason intra-club scrimmage (younger vs. older age group) and both coaches just said to leave the player on the field. That's no problem with me, but I make the original call to show I'm not incompetent.