That one is one of those grammatical situations that I literally remember as "it works the way that does not make sense" since it is the only subject where the possessive form does not use an apostrophe before the s.
But it bothers me too, not as mistakes by other people, but when I do it - I meant one thing but out came the other, it's frustrating and feels uncanny/alien, like having your controls mapped wrong in a video game.
Yet I will not endure the fatigue of living without gesture-typing on my phone (the fantastic HeliBoard, but with a proprietary google gesture typing library). I ofc always have automatic autocorrect off (just suggesting are on), but with gestures you have to correct things like "it"~"it's" like 50% of the time & my eyes are getting lazy.