eecms-cform.min.css from cform - why does this exists?

It is required for certain custom form input types, like Grid and Relationships. That said the current shipping version is a bit overzealous and can cause some conflicts with existing CSS. If your form is not using Grid or Relationships you can get away with setting the parameter include_assets https://docs.expressionengine.com/latest/channel/channel_form/index.html#include-assets to no

Thank you James. I actually have just a few input forms…that’s it , so I don;t need it. Thank you again, Bogdan