Actually not true in the slightest. Microgravity removes one more confounding variable present in all experiments gravity. One example, in addition to those alr

Actually not true in the slightest. Microgravity removes one more confounding variable present in all experiments gravity. One example, in addition to those already mentioned, is crystallography; where it's much easier to grow the crystals we need for experiments in space than it is on Earth where gravity is constantly present affecting the growth. Those results are useful here on Earth but can only so far be achieved in space. Even beyond things like that the only real way to study the effect of space on the human body is to put people up there for a long time and test. There are some analogues available here on Earth but they can only really test a few things at once like fluid redistribution and not the entire set of effects. https://www.nature.com/articles/npjmgrav201510 https://www.nature.com/articles/npjmgrav201510