“Its” is much easier to remember as possessive if you understand it’s a possessive pronoun, like his, hers, ours, and theirs. No apostrophes in any of them.

I don’t understand what you’re saying about “mass” possessives. That never went away, except for people’s who don’t know how to do it correctly.

I love these. I bought a box of the lavender ones two years ago and it’s still 1/4 full. They’re so much easier than liquid or powder to stash in a bag and carry around if you have a communal laundry area like in a dorm or apartment building.