As a society, it's easier to do everything at once rather than one thing at a time. Edit: The difference with nuclear is that it's so much more expensive than other green options that spending on it now takes significant potential kwh out of the grid if it is given equal funding priority.

Although you are right in the sense that nuclear produces steam, I am not aware of any instance of this having been done. The steam turbine is such a small part of a nuclear plant.

In my view nuclear is best as a baseline production and heat production method. The baseline part may reduce as grid batteries smooth out the volatile production of the renewables.