Maybe I also don’t understand correctly but this does not seem to fix the issue you list.

From what I can tell the issue is that people are accustomed to a ‘report a problem’ / ‘fix the map’ link on a map. For one reason or another they do not realise you can edit the map themselves so go out of their way to seek out a contact form to kindly let OSM know.

The current link is helpful at replying to these people but why not just address the issue at the source? This method currently wastes both OSM and these ‘helpers’ time, reducing the chance of getting there issue addressed.

I believe that on the homepage there should be a ‘found an error’/’fix a map’ link when users are not signed in. This would avoid cluttering the homepage for ‘normal’/registered users and further serves to encourage participation to new users.

I feel the new design is a huge step in usability especially for new users but you can never put too much polish on the little things.