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Guiding is retrospective, so it minimises tracking errors - they still occur - they just get adjusted continually - after they occur.
Excellent PE stops them from happening - thats why the Paramount ME is a 1 arc second build quality - I've heard of ones that track to 1 arc second an hour precision!
Guiding is like driving round a bend fast and having a safety rail that you keep bouncing off, so the worse PE - the more scratches. Fewer corrections - better shots.
Worse the larger your PE - the more chance it is uneven (irregular) - so the harder it is to guide out - or put another way the higher percentage of time you are gathering photons and you're off target on your shot.
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