Well I guess we can agree to disagree.
I think its not only easy to concentrate on and duplicate in your mind as well as in your practice stroke the speed, feel, contact point, angle of the cue stick relative to the table bed, and perception of the desired reaction and follow through of the actual hit, I think its imperative to do so each time.
I see warm up strokes as a method to verify alignment and to determine what spin, if any, you will be putting on the cue based on the contact point.
Exactly why the actual hit should as close as possible mirror the practice stroke. Any change in the stroke will have a negative effect on the accuracy of the contact point on the cue ball.
I play mostly straight pool, which is overall much softer hitting, much closer shots, and much less prone to inaccuracies that the long hard cut shots of 9 ball would be affected by with bad hits on the CB, but even then, taking a break shot as an example. I take more forceful practice strokes and stop dead at the cue ball, exactly evaluating what the result would have been on a full follow through. If its off slightly, I'll do it over, adjusting and again precisely evaluating the entire result of what would have been on an actual follow through. That includes both the OB an CB path, the carom off the rack and direction of secondary balls as well as the CB.
I can't imagine taking the effort to assure that, and then, on your actual stroke, you add or remove another 3 or so inches of backstroke and follow through longer, shorter,harder or softer than you originally felt and envisioned.
The result may be good, may be bad, but it surely would be different that what you just practiced.
Perhaps I'm not explaining well, but I can say without a doubt, that FOR ME, this approach brings me into dead stroke much faster in a game because it enhances my confidence level so much that I will carry out what I have just mentally rehearsed, because it was perfect in rehearsal, and now I'm going to do it exactly the same way but for real.