RussR
En-Route
What advantage does that have?
I agree with your implication that there is no advantage. I can't see any. The most commonly stated "advantage", of course, is that you will then have a backup of your flight times if you lose your logbook. But no, there are much better and more useful ways to do that.
Filling out an 8710 means that instead of a 30-second logbook endorsement, now you have a _minimum_ 10 minute computer exercise. More when the applicant realizes they forgot their password, etc.