Joysticks: Probably Still Drifty
Joy-Con joysticks use a potentiometer to read the voltage at a wiper that slides across a strip of resistive material. That material wears down over time, or plastic and dust can dirty the sensors.
Stick drift is a huge problem with other Switch models. One survey found that 40% of Switch owners had problems with their Joy-Cons drifting, and things didn’t get any better with the Lite or OLED editions. After a bunch of lawsuits, Nintendo’s president even admitted it and apologized, setting up a free repair program for customers in some parts of the world.
Eh, those rails were a huge issue over time for people who primarily used their switches in handheld but did swap/remove joycons semi-regularly. My launch model (that I ended up giving to a friend’s kid when I got my Steam Deck) would often need me to attach and detach the right joycon a few times to make it fully register that it was connected.
But yeah. Tinfoil hat and all but a LOT of speculation is that the magnetic based connection is to prevent hall effect aftermarket sticks from working since those are also magnetic. TMR isn’t impacted by that but the vast majority of folk would have never considered TMR for a gamepad until the past year or two.