> One thing I regret is the experiments as well. In physics and chemistry they were kind of a blur.

Well, a lot of places would penalize you if your data is incorrect, so most of the focus ends up on execution rather than the why. If you were angling for a high GPA for whatever reason, you cannot afford to experiment too much during lab work. It's another case entirely of course if you are conducting research.

Really a shame because understanding why your results were incorrect is much more important than stumbling on the right answer by accident.

> the focus ends up on execution rather than the why

Exactly right. School teaches you that the point of running an experiment is to try and get the same result as the teacher, while performing a ritual with steps called "hypothesis" and "method".