They don't universally, investigate for yourself. Not saying they don't, just saying they appear to need help getting the predicted result.
There are many puzzling thing that are universally accepted that I don't whole heartedly accept any more.
Cavendish established the universal continent for Gravity over 200 years ago and no one has ever repeated that experiment although we surely have better technology than existed then. We have calculated repeatedly almost every other physical constant, but not that one. In fact the speed of light seems to be slowing down or we are just getting it wrong. Just thing that make me go Hmmnn.
I can remember well the first pictures of the moon landing and have had a hard time believing that those flimsy space suits could protect the astronauts and yet have wrinkles on them. Just the heating and cooling alone would seem to require more energy than they could carry.
“They don’t universally, investigate for yourself.”
If they don’t, then the experiment wasn’t set up properly. It’s not like this experiment hasn’t been duplicated countless times.
Besides, if you doubt Focault’s pendulum, there’s an even easier experiment that requires no fancy setup or electric motors, etc. Just get a basin of water and poke a hole in the bottom to demonstrate the coriolis effect. Then try to explain that away with a flat earth model (including why the water swirls in opposite directions depending on the hemisphere).