Depends on the situation and the captain. Some captains will extend the flaps without discussing it first when he sees it appropriate but 95% are much more relaxed and more CRM-minded and actually lets the FO screw up and learn something, just monitoring things to keep it safe.
The world will not end after all if you cannot get stable by the gate and go around, actually making a go around can be good from time to time. In my company a rough estimate is one GA per 1000h flown per pilot and it is often a skill that gets rustier than other routine stuff such as visuals for example, GA is a life saving maneouvre while visuals mostly are for fun and saving fuel.
Most good captains here stay somewhat passive and let the FO develop and make mistakes as long as it is safe. However when things are more safety threatening beating around the bush is not very productive. Keeping a brief and clear "I think we are much better off..." "Let's stick with the SOP and..." "No need to be a cowboy let's..." etc is needed, there are situations where sweet talking can aggrevate situations
