Why is "burning paper at the grave" the most backward form of folk worship?

In fact, the important thing is not the paper, but the ancient rituals of ancestor worship! Because the ancient intention of burning paper money is their ancestors to go to the netherworld, there may be a lack of money to spend, the need to use a hammer and print copper money on the wood, in the paper next to the branding of copper money. Then while it is burning, the words such as ancestors come to get money should be recited silently under the mouth. However, because of the well-known 10-year event 40 years ago, this custom and funeral tradition was replaced by the laying of flowers, bowing, memorial services, and cremation. People are sending flower offerings or just buying printed burnt paper and burning it, making this ritualistic custom further simplified!