I think I may be simply echoing what's been said above but I have many watches with inscriptions and, to my way of thinking, they all add to the watch's history.
I have a couple of boxes of plate (silver plated trays and such). One of these pieces is a set of 6 egg cups. When I was sorting through them, I found a very worn card that showed they were a wedding gift from 1921. It touched something in me, so I laminated a new card with the details of the gift - the date and names of the bride and groom - and stuck it on the underside of the tray. Without that, they're a pretty uninspiring set of egg cups. With it, they're still an uninspiring set of egg cups ... but they have a story. It's the same with my watches ... whether it's "Love, Ruth" or "H. Griffiths" or the Benson that was given for 47 years service. It's their story.