To pull the thread on this sweater a bit, are not all military procurement choices political in the end? The government sets the priorities and we fall in step. AOPS was a priority for the Harper government for a some domestic political reasons but also because we were essentially blind in the ground (ocean? lol) truth up there.
My understanding is the proper way to do this is the government sets the priorities, military does some work and says this is what we need to do that job, and then there is some haggling and a process starts for the particular capability that needs to be provided (either by training, reallocation of resources we already have, procurement of new equipment etc...).
The Harper government wanted arctic operations for the security/soveriegnty. Whatever that motivation sprung from, and whatever it turned into that was the direction given to the RCN (well actually no Royal at that time!). Their election promise was armed icebreakers. The RCN needed patrol boats (its in Leadmark 2020) and so the haggling began. RCN came back to the gov't and said true icebreakers were a no go but we have this requirement, matched up to army requirements for arctic deployability/sustainability and AOPS was born.
So how is that any different then the CSC? A political choice, made by politicians for political reasons (the missions they have assigned to the RCN through Strong Secure Engaged, and before that the Canada First Defence Strategy) lead to the CSC being built. The only difference I can see is one of the missions is one the RCN traditionally held and actually wants, while the other it rolls its eyes at and doesn't really want.*
*Caveat that with there are A LOT of sailors who want to sail on AOPS. Small crews mean more responsibility at a Jr rank and some people just thrive with that.