Well it's not really 'all about her' it's about celebrating the legal and emotional union of two people who are in love and want to spend the rest of their lives together.
The me me me mentality is a new development in the last few decades. Brides in our grandmothers and great grand mothers times never acted this ridiculous. Nothing in life is perfect. When you start demanding your 'Special Day' be perfect, not only are you setting yourself up to be disappointed, you become a nightmare to deal with.