I am not saying the concept is superior right now. I am saying it is worth thinking about. And when you have the fuel cell only as addition, maybe you don't need the big pressurised tanks.

Maybe a small methan tank.

Maybe even then it is still not worth it regarding the extra weight and cost. I don't know. But I do know that the involved technologies are advancing and combining things makes sometimes sense.

edit: and the market is big. there are also people living in remote areas who sometimes want and need range extension in which case they could pack in some extra tanks.