It amazes me how many Founding Fathers were part-time scientists back in the day.
That is not true. I guess you mean in the sense that our horizons have broadened because we have access to so much more information than people used to have, but in terms of things that can be known, nothing has changed. The facts of the universe are the same as they ever were.
https://graphics8.nytimes.com/packages/pdf/education/harvard...
Nothing never: smart people with enough income to have liberty to pursue their passions and means to share it.