Yeah I can see where you’re coming from.
For my, likely outlier, use case with a coach working with people on the daily it could be nice to see those messages included in the search. But for the most part I don’t think others use their communities in this way.
I personally rarely ever DM here in this community. But as I’m managing another community I’m DMing all the time and trying to get back to certain DM threads all the time. I personally am fine with using the in: messages boolean. I’m all about the shortcut keys!