We do have a lot more Einstein level discoveries than most people may realize. If anything, we have so many discoveries that it's hard to single one out for special consideration. The big difference between now and then I'd argue is that progress is much more incremental today so that it never seems like you just wake up and there's one major breakthrough that comes out of nowhere. Instead we're constantly being exposed to small improvements that add up to significant advances over a 15-20 year period.