Weather Sealed Lenses

I am currently trying to work out whether to commit to the NEX route or the 4/3 Route.

A big draw of the OM-E5 is that it has a weather sealed body. However, what is the point of a weather sealed body is there are no lenses for it? It somewhat defeats the purpose doesn't it? Presumably without a weather sealed lenses you risk compromising the body in wet rain conditions?

Is there a list anwhere of all the weather sealed options? I am finding it difficult information to find!

Thanks