The finger slide is only audiable when using certain types of strings. So depending on the strings used you may or may not hear the slide. But of course guitarists can avoid the sound if they lift their fingers properly off the strings before moving them. If you hear the finger slides on recordings it is because they are supposed to be there. They are intentionally making that noise. They would not have left them in the recording if they were accidental. In live performances however you can get accidental finger slides or omission of them. But it is wrong to attribute this to a guitarists lack of skill.
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