But it's a private market? the only people who should be suffering are those who own generation equipment which can't keep up with the higher rate of change of dispatch. E.g. Steam turbine operators.

I think your point has some merit if the net effect is higher power prices overall. Unfortunately I don't have this information...

Either way, the reality is that renewable technology is making the slow-ramping generators uneconomical. Even if you remove wind-farms from the supply side of the equation you still have roof-top solar eating into the demand side and creating a daily demand profile which requires gas/liquid fuel generators to match.

I've seen a recent example of a cool summer day (Australian) where the daily demand minimum actually occurred at mid-day due to coincidence of maximum roof-top solar generation and low air-conditioning use! Under this kind of scenario your nuclear/coal steam turbine will be running at a horrible financial loss...