This is a huge problem in our society. Corporations line up to throw money at unicorn mega experts that largely don't exist (ie. are quite scarce compared with the demand).

The interesting thing is IME these engineers only have so much to bring to the table, and often have to push through the same technical hurdles. A passionate, hard working junior may get more done, if they have experience at the company.

Among even competent senior engineers, these mega-performers are unicorns. For every one that will save any project, or at least greatly improve it, there's 5-10 that are just okay.