I like the make a mess interaction because it makes child/toddler sims a bit more realistic, even if that means they can be a nuisance sometimes.
However, I do have a mod to lower the prevalence of it, so now I still see it but not quite so often. I also have another mod that spawns janitors at my community lots, so when they do make a mess, a sim is pretty quick to clean it up.
as a side note, wouldn't that playground look so much better with a set of swings and a slide instead of consisting of 3 monkey bars?? Oh, how I miss being able to edit the worlds ;___;