u/CeceSzak

Having a Tradable Source of Lava is great for a lot of things.

For a Traditional World, if someone is struggling to find a source of Lava, a Wandering Trader or Weapon Smith can supply with an easy source of Lava before you make it renewable with Dripstone,
Speedrunning with Villagers will be easier,
and allows no Structure Flat Worlds will have access to Lava, allowing those worlds to have access to Stone and the Nether.