I'd say that the reason some are clamoring for delays and reverbs is because there are limitations associated with using the one effects loop on the KPA.
First, you can only send midi messages on Rig changes.
Second, turning off the effects loop in the KPA doesn't let delays and reverbs trail off.
There are workarounds to these issues, but they require a whole bunch of cabling and extra equipment beyond simply "having an H9" or other effects, as someone suggested.
1) You need cables for the effects loop going from KPA to pedal board
2) You need a midi cable going from KPA to pedal board
3) You need a power supply for your external devices and/or a power strip on your pedal board
4) You actually need a pedal board (which you don't need if you have the Remote and were able to get by with just KPA effects
5) You need a case for your large pedal board (which you don't need if just using Remote)
In short, the beauty of the KPA+Remote is that it's designed to be all-in-one. I would LOVE to be able to use it that way. Just one cable from guitar to KPA, power up the KPA and run a Cat5E to the Remote. Just "including an H9" requires a lot of extra equipment to lug to gigs and twice as much set up time. All for what? because the KPA hasn't developed the Delays and Reverbs that a lot of guitarists these days, even far off things like Spring Reverb! However, the KPA was always marketed as more than an amp. That's why it included a swiss army knife of effects from the very beginning.