What's your solution to the local knowledge problem? Capital markets are like other markets. Capital gets allocated to where it's needed, holding aside market failure (which is what regulations are supposed to fix). Capital owners seek out the best return/risk, and because they are on the ground and diverse in views and skills, that solves for the local knowledge problem.

This is where startup seed funding comes from, capitalists like YC who are good at it rather than some incompetent. It's why bad companies eventually lose the ability to raise, freeing up societal resources.

What appears to be implicit in your comment ("There is no need for a capitalist") is an advocacy for central planning for capital. Although you also say "they can pay taxes" so maybe that's not what you're advocating for.

If you want to know what I think is best, it's possibly a wealth tax applied on global wealth, along with stronger regulations around media concentration, political spending, and a few other things. But to eliminate capital markets and push it all into a central planner is bad.