Interesting, just now reading up on this.  A couple of concerns though:

1) The mining schedule (to me) is basically acting like a premine even though there isn't technically one.  These types of block reward schedules feels scammy compared to a more smooth curve rather than a drastic difference between mining in the first four years vs the rest of the chain from then on out.
2) Supply numbers: along with the reward issues, I'm not sure increasing the amount x10 will do anything better in terms of chain security.  Not having a tail emission plus having a supply total of 210,000,000 only ensures the few people who know about Arrow from the first four years have an unfair advantage.
3) Still having to trust the people behind the genesis block of Z-cash and Co.

4) (not really a con but more of a question) Not ASIC resistant?

Other than that I really like the idea of a zk-snarks crypto that enforces mandatory shield transactions.