Sneakers for the entire wedding?

My to-be MIL and SIL think I'm crazy because I dont want to wear heels for the ceremony....I absolutely hate heels, and I want to be comfortable. The only argument I've heard is heels make your posture better for photos..but I've always had fantastic posture anyway. So, will it really make that much of a difference? Or do I just go with the sneakers and tell them to buzz off? Lol I attached photos of what I did to my shoes 😊 I absolutely love my wedding shoes!!