On every site except on SO and MSO in the top right of a user's main profile there is a link to the same user's meta profile and on a user's meta profile there is a link to the same user's main profile. Here is an example:
I want to suggest to add this kind of links to SO and MSO (I am aware of there being links to all accounts in the profile but this is not what I'm suggesting). This suggestion was argued against but I think that argument is bad. Even if MSO is independent of SO it makes sense to have links between user's profiles (for which there is an account of both sites). After all, there is an important relation between SO and MSO even though the former is not strictly the parent of the former. Adding such links will make
- it more convenient to switch between user's SO and MSO profiles, and
- the structure of profiles will be more consistent across the SX network.