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Hmmmmm not really.
During the set up and calibration you can move the reticle to sit "virtually" exactly where the slit is positioned in your telescopes optical train. For convenience the length of the slit is usually orientated N-S so that any drift just runs the target up the slit and widens the spectrum. With such accurate guide software a PHD etc the star never really moves. remember the "ideal" slit width is only 3-4 pixel wide..
It's nice to be able to "see" the slit by virtue of the reticle and ensure that the target is as central as possible to the slit height. Also, if you want to get the spectra of nebula etc it helps when orientating the slit to get a spectrum of different/ various areas
When you've used it a couple of times you'll get a better appreciation - I love it!
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