I'm legit confused on what you're trying to say. Are you saying tech stacks are a bad thing? Or that corporate investment or connection to a tech stack is a bad thing? What's your proposed solution or alternative?

One thing I _think_ you're saying that I do find important:

It's crucial to have experience in more than one ecosystem and tech stack, as you learn a lot from seeing communities reinvent the wheel and not learn from one another. You get to see common patterns in software development and engineering and, sometimes, you find novel approaches that are completely alien to the engineering ecosystem you started out in.