This may help you refine your intuition about why it could matter: https://www.youtube.com/watch?v=GuCdsyCWmt8&t=5m0s It's an electron microscope animation of a needle passing through a record's groove.
(I would note that due to the way the recording is made, it may be the case that a real needle would jerk around a bit more. On the other hand, it wouldn't have to jerk around much before this entirely stops working, so I'd guess in the end it's probably pretty accurate.)
(I would note that due to the way the recording is made, it may be the case that a real needle would jerk around a bit more. On the other hand, it wouldn't have to jerk around much before this entirely stops working, so I'd guess in the end it's probably pretty accurate.)