New Biome Bases on a Certain Block

Do you all remember when Mojang added deepslate and tuff? Well, Mojang might've missed a certain thing about tuff. Tuff is just solidified volcanic ash. And where does volcanic ash come from? That's right. Volcanoes. THEY NEED TO ADD VOLCANOES. If they do though, they should only leak lava down the sides, and sometimes spawn more lava for a certain amount of time. And tuff should be around the volcano.