What's the point of BB-8?

I guess i'm a lone gunman here who's just all by himself on this but I do not like BB-8 really. It's been well established in star wars that there are little robots that can hover all over the place. Why is there such a droid that needs to attach itself to a big ball and not just hover instead. In ANH there's recon droids flying all over the place. That was decades before this movie.

Mind BB is really cute and will sell huge to kids. But the whole concept of him is utterly stupid in the star wars universe. It's been said that he's R2's original design and now they're just using that design however I believe they didn't use that design because it was stupid.

And it's still stupid today. It's star wars, it's full of shit that floats and flies on its own power. So to have a droid who's stuck attached to a ball all day by no means makes a inch of sense to me...

I'm stuck here trying to figure out how this droid exists in a world where everything has hover power... I really am. I hope they explain it in the movie and not just leave it as some bullshit that you have to make shit up for which is star wars' MO truth be told...