I totally understand not getting why it's valuable - I'm not 100% on board either. But you're asking why it's funny to talk like a caveman? You might as well as

I totally understand not getting why it's valuable - I'm not 100% on board either. But you're asking why it's funny to talk like a caveman? You might as well ask why farts are funny. Maybe this one's execution isn't great, and maybe the joke doesn't work at this length - but the origin of the humor? Not to be insulting, but that's akin to a Lieutenant Commander Data question...