The problem is of course, all too often the profile managers are non-responsive. In my experience about 50% of the time, you're messaging a black hole-- either an absentee camped out on hundreds of flimsy/flawed profiles, or a once-keen colleague who's ability to contribute was crushed by Pre-1500. Half the time, sending a bunch of thorough, specific, source-cited details to a non-responsive profile manager yields a one line response saying "sorry I can't help" or "this isn't my fault" or "I've orphaned the profile." Of course some of the time, the system works the way we'd all like it to, and that's great. But in my experience that's the exception to the rule, and the more common effect of doing somebody else's work for them, is they keep not doing it themselves. Conversely, leaving the truth on a public comment on "their" profile has many benefits:
Firstly, and most important, it makes the truth available to the READERS of this site, who are more important than we mere members. (We are after all, all of us doing this for the readers, right, for posterity?)
Secondly, it makes the truth available to the universe of other stakeholders who visit the profile page, and/or interact with the current profile manager.
Third, it creates a constructive, transparent paper trail for relevant projects and working groups which might nominate a new member to co-manage a de facto abandoned or otherwise-problematic profile that's going unfixed for months or years.
Last, it avoids the one-to-many problem where multiple site members simultaneously private/direct message the profile manager with hints, suggestions or complaints about the same profile. The same gremlin. Better for that to be done on the profile page, where multiple helpers/complainants can all benefit from one public comment; than to have all of their redundant communication cohering into a perceived negative experience for the profile manager. In my opinion. YMMV.