You wouldn't choose a top-tier React & AWS dev if your veteran Cobol dev had just died of old age and your business-critical Cobol & SAP monstrosity needs urgent changes to handle this years's tax compliance updates. In that situation, you'll pay the $20000/week or whatever oaiey quotes you.
All right, so maybe you feel bad now about not listening to the engineering team and maintaining a continuous migration of your business-critical code to modern platforms over the last 30 years. But that's all in the past and your million-dollar business will be shuttered by the tax authorities in three months if you don't get this sorted out right now.
Maybe we'll have a world one day where everyone knows the "obvious" fact of technology leadership that everything should be continuously migrated to the state of the art. But maybe we won't, and maybe this fact isn't obvious at all, or even correct. Who knows?
In the meantime, people with skills that have an extreme demand/supply factor can command the highest rates, even if they won't be hired at tomorrow's startup. That's not to say it's a bad idea to learn current skills (for diversification), and definitely say no to working with legacy tech for small money, but that's really an orthogonal point to the one oaiey was making.