When they do run into such players or when they lose because of a weaker grasp of complex controls they may be discouraged just as much if not more.
They definitely can be discouraged by the poor tutorials. They can be discouraged by new additions that are explained in blogs that may never be read by causals or new players.
I am not saying they are or not interested. I am merely stating the fact they are less likely to seek out advice than the comp or sim crowd. This puts them at a disadvantage in terms of learning the meta which may discourage them when they get beat for reasons they don't understand.
If they care enough come to forums like this for an explanation they are often met with git good which is discouraging.