One way to look at this is that Jarvis AAV is a better representation of Jarvis actual compensation over the 8 years of contract. The larger "total value" is a bit misleading since it includes the interest on the deferred money. Canes for essentially "borrowing" Jarvis'es bonuses for a few years, so that "extra" money isn't really compensation for his services per se, but simply interest on a loan. If Jarvis gets this money "on time", he can loan this money to somebody other than Canes, and I hope everyone agrees that the interest he gets from his investments would not count against the cap.
With that in mind, I think it's clear why this "circumvention" isn't popular. It's not all that great for the players, the interest they are getting on deferred compensation isn't all that great. It's also clear why it's happening now, with the interest rates a little higher.