I think this is fundamentally misdiagnosing why Macs haven’t dominated. It is actually not about the monitor support but about:

- government and corporate bulk contracts ?and this is usually a result of software only working on Windows.) - expensive (thus affecting for most home users and also corporate bulk buyers who can not tell the difference.) - lack of high end game support

That is why it doesn’t have more market share.

You are thinking too much about minor technical issues.