I would imagine RTwP would lead to a few fallback strategies. For example, you could have a party of 4 warlocks and you start every fight off with 4 crowns of madness. Chances are, before the fight really begins, the enemies are all fighting each other. You wouldn't even have to worry about spell slots cause warlocks get them back after a short rest, which is quite a bit easier. I imagine this is also possible in TB, but I think the ease of it in RTwP could make these cheese tactics common and possibly dull the combat.