I think there will always be casualties where individuals get left behind in fast growing companies, but I don't think generalist vs specialist is the biggest p

I think there will always be casualties where individuals get left behind in fast growing companies, but I don't think generalist vs specialist is the biggest problem. First of all, because it's extremely reductive. People have different skillsets and potentials across multiple axes. The generalist vs specialist distinction tries to make this binary when it's not even a single continuum. Yes, in practice companies will need more specialists, but the thing about a generalist is they do lots of things, so there's always something else for them to pick up on and dive deeper on. By the end of their tenure they may even find themselves in the specialist bucket! But in any case, this transition doesn't happen overnight anyway. You will always need people to explore new areas, and you will never be able to find the perfect candidate for every role you dream up. In practice you want to hire great people whenever you can get them and help them find their own role.