Even if sustained fusion were achieved, it has issues with degradation of the vessel/equipment from high speed neutrons? LFTR scaled down to a closet, so with

Even if sustained fusion were achieved, it has issues with degradation of the vessel/equipment from high speed neutrons? LFTR scaled down to a closet, so with "mass production" you could just replace the vessel at "reasonable cost", but these fusion facilities are massive and expensive.