So "parallel" is how the cue movement starts, but not how the cue ends up (angled as usual to compensate for deflection). I think that's what I'd call "adjusting by feel" - I do it a similar way, except I make the slight adjustments while getting down on the shot without placing the cue on the shot line first.
The word parallel implied to me that's how the cue ends up.
pj
chgo
The part in red is wrong. You use a straight stroke with parallel english. The cue is also much better aligned with the path of the cue ball than when using BHE or FHE.
The cue does end up very close to parallel to the original alignment using no side spin. Parallel english requires less compensation than BHE or FHE.
The important thing to understand is that even after the tiny adjustments needed for some shots the angle of the cue stick before and after shooting is nowhere close to the angles it will be to the path of the cue ball using these other forms of english. As I have repeated many times, BHE has the greatest cue angle compared to the cue ball path because the bridge is basically the pivot point, FHE has the next most angle since the pivot point is basically the grip. Since parallel english involves a parallel shift of the cue stick to the side there is no physical pivot point.
Hu