To be fair to Icelyn, folks who know me might be justified in thinking of me as one of the strongest proponents of sticking to the written rules where possible and as faithfully as reasonably possible for the game's translation... and others might go further and consider me one of the strongest "5e is an ideal system" debaters on this forum (I'm not, and it's not - it's definitely got its problems), but I am also a strong proponent of the more or less arbitrary bonus action casting limitation rule being completely abolished and forgotten about, as long as the restriction remains for quicken spell specifically (without locking out reaction spells on the same turn, too). The universal Ba casting restriction does not need to exist in the 5e system, and only harms enjoyable gameplay.