"Web 3.0" and proprietary hardware makes me suspicious. Impossible to tell whether there are some good ideas in all the new coins coming out, and whether those ideas will work.
Impossible? No. Hard work? Yes. White papers, interviews, thinking, and using. What, after all, made BTC so popular? Easy to use! Initially.
Not many. Perhaps you mean Impractical. I only contend that it's Impossible. Skycoin's match with fractals is why I was interested in it to begin with. Not many catch my eye.