It's sort of funny how you read into things. Let's see, I worked for SIG's west coast LE distributer before becoming a cop and actually went to my PD with a SiG order. Split a half a million rounds of .45 between multiple SIG and HK pistols and hold Armorers certificates on both. Shot a dude with a SiG. Won the Top Gun shoot for the largest county in the US in a match in which the host agency set it up to be very Glock centric to their issues guns...won every single course with a SiG P-226 and the overall title. Have shot over a quarter million rounds through Glock 9mm's. Ran a program with issue HK's, SIG's and Glocks. Owned my own police equipment store and sold extensive numbers of both SIG's and Glocks. So.....I may have a clue about various discussed service pistols, reliability in the service environment, law enforcement firearms acquisitions and testing processes. The point here is HK made a decision to produce the VP9/P30's with an enlarged magazine based dimensionally on the very successful P2000/USP Compact 9 mm dimensions with various improvements for enhanced long term reliability in the military and LE environment. HK made an engineering decision to build it as a 15 round magazine. No matter what you think about HK, from an engineering standpoint, they tend to build very reliable and heavily tested guns. It is why there are very few changes over the life of various guns. How many variants of Glock magazines are there? Why is that? Do I think HK could make a 17 round magazine....sure. Do I think there is a reason for the 15....yes, and I like the reliability aspect and durability. Wayne and I likely see more HK magazines mixed with other guns than most and are making an observation based on experience rather than "fan boyism". What is also funny, is in Dobbs case, he also has a ton of time on the M&P 9mm as well as being a very respected and recognized subject matter expert on the Glock as well. But, it's the Internet, so we can be labeled fan boys because it is a place where real experience doesn't mean much.
Then again, I was one of the first guys cutting down G17's to take 15 round 19 mags, so I am notorious for liking sub capable low capacity high capacity 9 mm's.
This comes down to something Wayne and I do know something about....LE purchasing. Fact is most of this is theater and most places set up testing to get what they want and be able to say they had a "fair" process. It is mostly b.s. As most places get what they want before the testing starts. The Sig 320 is a good gun that has a ton of appeal for most LE and LE agency's for a lot of reasons. I just wish we could either say "we want P320's" (or whatever gun they feel meets their needs) or do a neutral test and winner takes all. The idea of building a test or criteria around what the agency wants is silliness.