One of the advantages with the MIT superconducting magnet design is that it allows the vacuum vessel and neutron shielding to be lifted out and replaced wholesa

One of the advantages with the MIT superconducting magnet design is that it allows the vacuum vessel and neutron shielding to be lifted out and replaced wholesale (n.b. this doesn't have to be every 5 years but it does have be done at some point during the reactor lifetime). The ITER design would require essentially disassembling the whole reactor to do that. In both cases, the neutron absorbing first wall will be replaced every 5 years or so which is indeed a substantial challenge requiring robotic operations.