It could be argued that ITER is actually quite important in learning how to deal with high technical complexity in general. Probably a good reason by itself to keep working on ITER, ISS is way simpler in comparison.

https://en.wikipedia.org/wiki/ITER#Criticism

"The project however was significantly delayed at the design stage as result of purposeful decision to decentralize its design and manufacturing among 35 participating states, which resulted in complexity that was unprecedented but consistent with the initial ITER goals of creating knowledge and expertise rather than merely producing energy."