Orbiting fusion reactors (was: Mirrors versus diffuse reflection)

Still, this container erosion sounds rather strange. Conventional fission
reactors, using uranium and plutonium, also generates lots of neutrons. So,
why don't they suffer the same problem of neutron erosion?
>>>>>>>>>>>>.

They do, but it does not affect the fission reaction.
The material degradation is a containment issue, and is handled by overdesigning the containment vessel to make it damage tolerant.

BTW the neutron flux from fusion is a good deal higher than for fission.