It's good enough for _startups_ working on fusion reactors, they can tolerate a bit of risk. But not for established companies making safety-critical equipment.

And modern MRI machines are not that expensive either, mass production made them surprisingly affordable. A top-of-the-line machine is around $700k, and mid-range devices are $300-$400k (and now I want one in my backyard...).

So the savings on high-TC supeconductors would not be that impressive overall.

People don't go inside a running fusion reactor.