At least two of those points can arguably be greatly improved or avoided in MSRs. Since the reactor is not pressurized in an MSR, no large heavy forged pressure vessel is needed. And the steam cycle of a MSR can operate with supercritical steam w. reheat, like a conventional fossil plant's steam cycle, reducing the mass flow needed by as much as as factor of two.

The other big savings for an MSR is a very large reduction in the size of the containment building. This is because there isn't water in there that would turn to large volumes of steam during an accident and that would have to be contained by a large pressure-bearing structure. Moltex claims their containment would be a factor of five smaller per unit of power output, compared to a LWR. This would be a huge cost advantage.