That's not accurate - go through frame by frame. Also - there's other forums etc. where the whole thing got dissected and behind the scenes footage. Mostly I remember reading some posts pointing out where it's clear Stan COULD do the knife fight stuff etc. What's unclear is why he wasn't allowed to do certain things re final cuts.
Best I can figure based on comments from actors and directors - not just for TWS - that it's a combination of insurance risks and protecting the actors e.g. the production. It's about money.
Sadly too accidents on set can and do happen. And companies aren't thrilled when productions are held up$$$. Fixes don't always work either like the notorious Superman 'stache.
View attachment 416437
I know the fight well. It's mostly a stunt double. Even in closeups.