Because it isn't a big deal overall. It is extremely far away from something really net energy positive that is, if you count efficiency of pumping the laser a

Because it isn't a big deal overall. It is extremely far away from something really net energy positive that is, if you count efficiency of pumping the laser and efficiency of converting neutrons back to electricity. Currently it's about 1% overall efficiency with no clear path to >100%. And even that is achieved, it's super far from economic viability. Because it will at the best case, amount to a coal power plant running on infinite free coal. Coal currently takes 20-30% of electricity price on coal plants. Getting a 20-30% cheaper electricity isn't a big deal.