Sure, basically any sentence more complicated than “this is a [noun]” will involve some kind of grammar that you will need to study elsewhere, and if someone does nothing but WK until level 60, they’d presumably not know that grammar.
Recently the series “The Making” on Youtube was recommended here, and I think it’s pretty good. It’s like the show How It’s Made, but each ep is about 14 minutes long and the content is described through captions rather than voice over.
As for how to find other stuff… search for what you like? I like golf, so I often watch Golf Channel Japan, which streams on Youtube, or just search タイガーウッズ or something.