Two things to note here.
Osmose has a check for that. The advantage of Osmose over MapRoulette is that it attracts local mappers who can pick and choose. MapRoulette is more of a contest and more accessible to non-locals.
I know from experience that fixing overlapping landuse is not trivial in many cases. We’re not talking about just moving a few nodes, like maybe with buildings. In many cases, doing it properly means remapping (including challenges like landuse glued to roads, landuses that do not accurately reflect the aerial images, complex multipolygons and the like).
You may want to raise this to “expert” level, at least in rural areas. Of course, one can choose the simple road and just make the error go away, but that doesn’t really help.