It seems that the Web Analytics parameters would be better associated with Campaigns than with Email Content (similar to a subject line, from name, etc).
There are cases where a piece of email content is re-used or triggered from different events (re-send a piece of content at another time to contacts that don't open the original....or a piece of content triggered from one journey vs. another). In these cases it would be good to be able to apply different analytics tracking parameters.
Also, you may have a different person building email content versus scheduling/sending a campaign and managing the business-side analytics. The technical email developer may not know what web tracking parameters to apply, but the analytics-side person would.
So, would like to see the web tracking parameters pulled out of the content editors and added to the campaign configuration tools (in Campaigns & Journeys).