Looking at the picture, I wonder if complexity of these devices will significantly be reduced once it finally works. I assume a lot of the bells and whistles are needed to find the way, but once it's found..
Your question reminds me of the image showing how SpaceX raptor motors evolved
https://imgur.com/a/4w3q3lSI'm not keen on the idea of applying a 'keep subtracting things until it blows up' mentality to fusion reactors.
I mean, it's expensive but there's nothing that can happen, they just stop working the nanosecond the environment isn't just right.
It'll be expensive, but will it be more expensive than the costliest disaster ever, Chernobyl, which apparently cost (is costing) $700 billion to contain / clean up?