why don't men wear suits for all occasions anymore?

Changing customs. I wore a tie to work every day, except casual Fridays, and even then jeans were not acceptable. We were taught to wear our best to church out of respect for God, and that meant a suit/sport coat if you had it or your best bib overalls if that's all you had. I rarely wear a tie now, even to church, but I still refuse to wear jeans to church, weddings, or funerals. Some men wore shorts to a funeral I attended Saturday. That is just disrespectful.