Lafiel said:
the problem has probably been identified by this user https://imgur.com/gallery/58bBc43 as you can see the analogue sticks Nintendo used seem to be very susceptible to wear of the contact plates, which leads to the miss-input experienced as drift that means all devices this type of stick is used in will sooner or later show the problem, depending on useage, but it also means it's quite easy to fix by installing new ones |
So, in a nutshell, they've cheaped out in choice of sticks.