Why do mosses and ferns need water for sexual reproduction, but not for flowering plants?

The thing is that the sperm and zygote of ferns and mosses can combine only in the aquatic environment. This is due to the antiquity of the origin of these plants. Scientists believe that, having originated from algae, mosses borrowed and transferred reproduction with the help of water to land, and the humid climate of the past made it possible to preserve this method. And flowering plants already lived in a cold and dry climate, precipitation became less, so fertilization began to take place from the beginning with the help of the wind, and a little later with insects.