AeronMelonOldie but a goldie
Counter point: close the lid to prevent things from accidentally falling in.
Oh man, you uncovered a memory. The first reddit downvote I received way back when was on a comment where I mentioned that closing the toilet lid makes mold/mildrew growth in the bowl more likely, particularly in humid environments.
zarkanianLuckily, there’s a simple way to avoid this. It’s called “clean your toilet”.