Sloths spin tales of eternity because they can’t do anything else. Shadows are just a thing that exists, but sloths make them interesting. It’s not like it matters or anything, but sloths spinning tales is a thing that happens. Maybe it’s important to sloths, who knows?
Sloths are irrelevant, their “tales” are just meaningless ramblings of a species that can’t even move without assistance, shadows don’t care about sloth drama.