No guy wants to feel he is filling the “Okay, I want to get married, and it’s about time, and here you are, so let’s go” role. That’s why my advice to her was to emphasize not her goal of “getting married” (which can make him feel like some kind of sperm donor or something), not her visions of the wedding, etc., but their reciprocal relationship and moving it to the next level because she really uniquely values his qualities and company and never wants to lose them.
Cuts both ways. As others have noted, if the commitment is there anyway, how much does it hurt him to humor her desire for the “meaningless paper and party?”
I was once in the Catch-22 situation that the GF kept picking fights with me, all the time, which (she claimed) were motivated by her desire to “know where the relationship was going.” I answered her quite honestly that I couldn’t see it going anywhere if she couldn’t go two months without pitching a tremendous fit. She said it would be “totally different” if we were engaged or married, because “then there would be a Lifelong Commitment” because “Marriage Is A Beautiful Thing.” She had a lot of maturity problems and was always searching for the Theory Of Everything (which when it wasn’t “Marriage Is A Beautiful Thing And Will Solve Everything Because Of Commitment” was apt to be “Huerta Is The Cause Of All Life’s Problems,” but that’s another story). I told her, unavailingly, that everything I had seen indicated to me that engaged or newlywed couples fought as much, and in the same way, as they did the day before they got engaged. Many women do hold out “Marriage” as a panacea to all life’s and a relationship’s discontents. This is not mature or realistic.
I decried this upthread and women who use the “waste” terminology are creating a false dichotomy based on the theory that their relationship with you cheated them out of the (hypothetical) relationship they could have been having with, say, Prince William, never contemplating that they might also have spent those 2 or 4 or however many years alone with their cats instead of being cosseted by you. It’s not a very attractive or grateful way to summarize a meaningful if not lifelong relationship.