Leaving all of them is in itself a human impact on the environment, you wouldnt find a single maple in a forest, but you also wouldnt find a field in a forest. if youre concerned about bugs I'd still be removing at least some leaves
really theyre a resource I'd collect them for compost heaps
I never liked the microblog format so while I've had acouple masto accounts since 2016 I never used it. But i also never used twitter.