I've not really had trouble with any party make up, to be honest.
Wyll, Astarion, Shadowheart and Lae'zel all make perfectly adequate frontliners, in this game.... and even when my sorcerer or wizard end sup tanking enemy attention, it's only rarely a big deal.
The fights where you'd really, really want a strong tank are so overblown that your tanks won't stand up anyway, right now, so it hardly makes a difference.
