I agree with a lot that you say and notice similar trends in our work. I am a little skeptical about this one though:

"You don't really need to work for a company anymore, because a solo dev can absolutely build crazy things, so it's not like you need to rely on anyone else."

One of the reasons for devs to work in company is not that they can't deliver the work themselves. It's that they don't have the connections to land customers. Most devs need a company at least to handle the marketing so they can focus on what they are good at.