The striking thing about this list, to me, is the preponderance of software companies. Making physical stuff is hard. But don't let that deter you, if that's what you're interested in. If things go right for Helion, it could be the biggest of the lot.

Paul Graham Major misallocation of capital imo. Most on this list won’t make it.

Not enough talent in manufacturing & heavy industries.

Elon Musk Interesting point, but an example might make it clearer. Can you think of a prominent person who's currently wasting his talents in software when he could be working on manufacturing and heavy industries?