There is an endless debate among historians, AFAIK, about whether events are due to structural (that is, systemic) issues or due to personal agency - the 'great person' hypothesis.
You are talking about science, which if course is one narrow domain; and even in science, I tend to agree with you but if there were no paradigm shifters (using Kuhn's model) such as Newton, Darwin, or Einstein, would we have made those discoveries? Would the whole course of research in those fields have changed? Changed to where we are now? Soon after those people? At all? If it's inevitable, why weren't those things discovered outside Europe? Was the Enlightenment, the foundation of the scientific revolution, inevitable? Again, if so, why not elsewhere? Why not 1,000 years earlier?
In geopolitical matters, would the world be the same without Napoleon, the founders of the U.S., Lenin, or Hitler? What about Admiral Nelson? What if someone else was U.S. President on 9/11? Clinton? Trump? Would the world be the same without Moses, Jesus or Mohammad?
My point is not that I know the answers, but that it's not so clear cut that outcomes are due to structural reasons.