The new profile page splits the information about a user into two pages, the Activity and the Profile page. The Activity page is generally more useful to moderators, which SE recognizes and made the default view for them even if they're looking at other users' profiles.
But the Activity page doesn't contain all the information that moderators need from the user profile. It is still sometimes necessary to look at the Profile page, and it is annoying that we have to look in two different places now to see information that was previously on the same page.
There's also information on the Activity page that I really don't care about when acting as a moderator. It doesn't matter to me how many badges the user has or what their next badge would be.
The information from the Profile page that is useful to moderators are mostly all the editable fields like the "About Me" or the user location and website. The age of the account is another piece of information that can be useful to know.
I suggest that the Activity view should be changed for moderators looking at the profiles of other users, or that the default view for mods is a third page based on the Activity page with additional information useful to moderators. The general idea would be to remove the reputation, badges and impact sections and replace them with something closer to the old header in user profiles. This would remove the need for moderators to switch between two pages of the user profile if they need access to that additional information.