That is true, but it is not the problem. Waste heat hasn't kept coal from being economically competitive. Things like specific power density and simplicity ar

That is true, but it is not the problem. Waste heat hasn't kept coal from being economically competitive. Things like specific power density and simplicity are much more important factors in the cost of most power generation methods. For example, low head water wheels are simple (thus low cost) but have poor specific power (thus high cost per kilowatt). The article posits that fusion will always have worse specific power and be more complex than competing modes of generation. I think it's way too early to be making that prediction. You don't try to raise specific power Trevithick-style while you are still trying to light a candle.