The last eruption was in 1707. It is said that the volcanic eruption at that time covered Tokyo with a thick layer of volcanic ash more than 1000 kilometers away.
There has been strong volcanic activity in the plains around Mount Fuji. Now Mount Fuji is a world-famous tourist attraction and a symbol of Japan.
According to legend, Mount Fuji was formed on the night of 286 BC 1. Now people know that Mount Fuji was not formed overnight, but they don't know how it was formed. It seems that scientists have to study it and give us a reasonable explanation.
Your concern is my motivation.