All the hate makes me a Seedman supporter. Do weird, difficult stuff. I think that's great. Challenge your body, learn and master some complex movements. I've found that weird movements gave me a lot more confident in grappling, especially because I used to have people lampoon me as strong but slow or whatever.
I don't know man, if you like doing simple, compound lifts, do it and God Bless. But if you like doing some other stuff, that's great too; doing heavyweight weight while balancing on an unstable surface is great. Safe? Maybe not if you haven't developed the necessary levels of strength and balance to do it, but pretty cool in my book.
The main issue I have is where people take the crossfit method--or the method they used to take--of saying that everyone else is making a huge mistake in fitness but that they've found the "real" way to work out. I.E., everyone else is debunked, this way is the legit, authentic way. There's a million ways to work out and almost all of them beat being sedentary.