I'm still confused as hell, but what would the benefits be of getting non-adjustable control arms if you can't adjust the pinion angle? And If I hardly ever hit the track, are control arms (adjustables) really that important?

 

No on a stock suspension car there is no need to adjust pinion angle if if lowered. The only reason you ever need to adjust your pinion angle is if you change your instant center (change the mounting location of either the upper or lower control arms)