Yeah, if it really is fine, there's generally no need to way so.
The one exception I can think of is when 'It's fine.' is short for 'It's taken care of.'
A child of 5 could understand this. Fetch me a child of 5.
If you can get to 50 without growing up, you don't have to.
There are very few personal problems which can't be solved by a suitable application of high explosives.