I've been practicing sight-reading on the piano, and been recording myself while doing so. What I've noticed is, my rhythm is inexact: sometimes the note lands either after or behind the beat, sometimes eight-notes are slightly shorter or longer, and sometimes the tempo accelerates as I go through the piece. After discovering this, I began to notice that it's hard for me to play an exact (or almost exact) subdivision, since my fingers won't land on the key at the precise moment, even if I can imagine how such thing would sound if they did. The problem is I don't even know if this is bad, or is just the natural way the rhythm should work. Ever since I started recording myself, I've become more and more aware of the imprecisions, even as I'm playing. Should I do something about it? If so, what?