Taking how awful multiclassing in 5e - should be a very low priority for Larian.
Same could be said about most of 5e. It's a very poorly defined and not very well thought out system. Doesn't mean this game can't be better.
Well, not all as awfully bad in 5e as multiclassing. They could just remove it completely, providing you would almost guaranty screw up your build, by multiclassing instead of soloing singe class.
