Tonearm set-up

My Micro Seiki MA-505L's installation template shows minimum (62 degrees) and maximum (75 degrees) for angles out from the straight line between the record spindle and the center of the arm base hole. Is this really necessary? As longs as the pivot to spindle distance is correct, does it matter how far the tonearm has to swing to reach the edge of the record? Not sure if this is about practical/mechanical reasons like positioning on the tonearm lift or if there is there some degradation of fidelity that may occur if the tonearm is set outside those parameters?

Thank you.