Re:MIT-designed project achieves major advance toward fusion...
by Firadeoclus on Monday September 13, 2021 @01:20PM
(#28514094)
Exactly, and fuel is only a part of the consideration.
Though it's also true that the infrastructure to process, deliver and store large amounts of fossil fuel comes at a higher cost than is usually considered (as some of it is subsidised and socialised), plus there's the pollution.
You might try to argue high fuel energy density implies low cost, but this is clearly not the case in general.