As this application is for a GM product what's interesting is the spacer in the upper right corner of pic #1. The spacer is used to duplicate the spacing that would be needed if Wix's typical thread end bypass was used. But as this GM uses block bypass here, no filter bypass is required. Keeps all the Wix applications similar in sizing among applications. Also likely why the Wix 'made fors' using a combo valve have a similar size and shape to the metal coil spring bypass as opposed to Champ ecores flat combo valve design.
As for spacing between can and element, these filters are designed and engineered so that there is plenty of oil flow. The only other time I've seen a similar mention was on an internet dissection promotion for another brand filter. It was based entirely on observation (not unbiased) with no scientific basis. In other words nothing more than internet fodder. I actually look at the exacting tolerance as a sign of quality construction. So I wouldn't give it a second thought.
Thanks for the pics.