I found that by the time I checked case length, then trimmed, it was easier just to put them in the trimmer, if they needed to be trimmed, I would, if not I would not, it saved a step and brass handling.
From sizing,trimming,chamfering,deburring,brushing neck,cutting primer crimp,and brushing primer pocket, I'm only handling the brass twice, once in the press, and once out, my hand does not leave the brass until all other steps are done. I can live with about 20 seconds or so per case to have them all done the same way For precision rifle rounds.