For the good or the bad of it, symbolism has always been meaningful to human beings in their milestones in life. People do care about such things because it's pretty much part of the human psyche to want to "mark" turning points.
That marking has become commercialized, seized upon by the modern corporate world and exploited. But even if you want to reject that commercialization, you can't stop the human desire to try to mark out a moment, a decision, a change in life, as special and memorable.
Most of everyone's lives are mundane. Things are the same from day to day. It's not surprising that many people are drawn to trying to make SOMETHING special, SOMETIMES, particularly when it's a life decision that's not supposed to come around numerous times.
There's nothing wrong with wanting to make a turning point like this a bit more special than just a chat and an agreement.
That's fine if two people really are into just a chat and an agreement. it's not fine for people who wanted it marked out more and didn't get to do that.