There are actually benefits in crawling before walking, you can google it & find out. I'm not saying that those who dont or didn't have problems...though the question has been asked so if you are interested in looking it up it cant hurt. It's also more than just using the "left & right sides of the brain".
I don't think there are huge implications, as many have stated they are fine...but just more so some benefits IYKWIM.

I was told just the other week as Charlie was starting to crawl, "the longer you crawl the better" but don't know how true that is.

In regards to experience, my brother never crawled & has had many learning difficulties & some other issues. Not saying that's the reason, just interesting to know that it could have been a contributor.