Yes, that is exactly the problem. If they are ever going to be commercially viable they need to become typical. 59MJ per cycle isn't going to do you a lot of good if a cycle time is measured in months as is currently the case. You have to get that cycle time down to fractions of a second at this energy level before you even have a chance at commercial viability. 59 MJ is a tiny amount of energy by the standards of commercial power generation.