I'd add that a genius like Einstein would have thought of fantastic things wherever he was – it just so happened that this was the experience he was exposed to which led him to think about time and light, per your story.
I wonder what sort of amazing discoveries he would have made if he had been exposed to, say, biology and healthcare instead!
I don't think this is true. Because of survivor bias, we have no idea how many Einsteins never had the opportunity. It seems likely there have been a million people with similar cognitive capabilities, yet very few make such progress.
That not a valid counterpoint to my claim in that itdoesn't negate the fact that he could have been a genius in many other fields if he had touched them and assuming he "had the opportunity". Similar to how someone who's highly athletic is usually great in pretty much every sport across the board at a young age and then later specialize into one (or more!) to get to a professional level.