Bombs are insanely powerful too and yet useless as an energy source. What matters is cost in cent per kWh. Fusion showes every sign of becoming very very expensive, even in the best case scenarios.

Laser based fusion for example literally uses gold coated diamond pellets, hundreds of which have to be shot into the reaction chamber per second to even break even energyweise in theory. At that point, no energy is produced at all and costs per kWh are still infinit. And the lenses get destroyed so fast you constantly have to exchange them.

Meanwhile both renewables and energy storage technologies continue to get cheaper and cheaper. Fusion faces barriers in engineering, fundamental physics and even in mathematics (modeling plasma is critical). Some of which might be insurmountable in principle. But in the end the one barrier that matters is the economic one. And no one even has a plan on how to tackle it expect for shoveling an insane amount of tax money into the fire indefinitely.