Depending on ease I will sometimes focus on power(velocity) and / or making sure no bad habits have crept into my form. The first few w/o's can feel easy depending on increments used in setting up the cycle , ect. but they serve a good purpose.
For example in the typical M,W,F approach you would start a new rep range on a monday after having 2 whole days to recover from what should have been a fairly close to failure in all movements Friday(or the last W/O of the previous rep range). The first few workouts in the new rep range , can be almost like a kind of extension of the recovery process , an active recovery of sorts allowing the CNS and connective tissues to stabalize and "ramp up" so to speak for the heavier loads , this is enhanced further by "zigzagging" and can result in better strength gains ( as opposed to just hypertrophy gains) through out the cycle.
This also enables extending the cycle after 5's for a longer and (hopefully) more productive total cycle as extending the 5's (wether with negatives or 3's or just continuing to progress the 5's or any number of other personalized ways to extend the strength phase) will result in more strength/size and higher 1rms on which to base the next cycle. Of course once the load progression is unable to be advanced the cycle must end , but the trick(s) to it is to squeeze as much as is possible from each cycle .