My opinion is we should always communicate first with an active manager before most edits to the profiles in his/her WikiTree stable (watchlist). To me, it is sensible and courteous to give the manager a little "heads up."
The WikiTree policy is that small edits don't require any communication; but for major edits, we should communicate first. Here is the relevant style guide link:
And, of course, always cite your source documentation for any major edits (and sometimes for the small edits, too)!