I suppose it greatly depends on how deep you want to get into optimisation. If you're really deep into optimisation, you'd want the card to match the burst profile of the job perfectly, which means what card you get and when is quite important, so the RNG is there in that case. But for most people, yes, the RNG is either 50/50 or doesn't matter (for those who just throw every card on the highest damage player).
That said, if we can't get HW/SB cards back, I'd still take the 50/50 RNG of ShB/EW over the zero RNG of DT cards.