I'm a bit perplexed about experiments like that. I get it why we did a lot of this in the early years of the Space Age to validate our assumptions about the hazards of outer space.

Then, there was some scientific curiosity about how certain life forms, such as complex plants or insects, might adopt to near-zero gravity. This was a bit harder to justify in practical terms, but interesting and hard to replicate by other means.

But what's the objective with this test? We can easily recreate similar conditions (pressure, temperature, illumination) here on Earth. So what have we learned to justify the cost? I'm not trolling, it's a sincere question.