Welcome to tech buys.....
this will happen. don't like it buy in less volatile tech areas. Products that don't have massive changed yearly if not semi annually. Example: bought a 3.5 mini jack preamp for my video work. To future proof I got the 3 xlr mic input one. Only have 1 mic now, wasn't even xlr based but adapters say hi....This future proofed, the company is not rolling out a new one anytime soon. BAsed on limited use so far...it doesn't need to. Does its job, does it well. No more camera hisssssss.
Apple rides a fine line. If they don't release new stuff every say 6 month we get the why is apple stagnant rants. People want the new items way too often imo.
This creates the problem of the new stuff has to have that selling point. More often then not...its going to be that something not in the prior release.
Also gets complicated with the production/manufacturing. Why doe this have a larger drive or other electronic doo dad? Could be at time of purchasing agreements things were a different price. I for example tend to not buy much electronics in the summer. since Taiwan a source for most of the components and I live in Asia region I know what summer time means for the Asia realm. Typhoon season. Of which Taiwan sees a few. Taiwan is a small island maybe 2-3 hour hop from my island prefecture. Typhoons that miss us and do can divert to there. Typhoon hits taiwain, market prices shoot up. If contract made at this time...it means contract for 1 million widgets shot up.
I own a NAS. I see price variance year round. I watch drive prices wax and wane as I wait for the killer price to upgrade the drives in my NAS. I am just buying 6 of them, I don't have clients screaming for more space (its just me and technically the wife but she knows nothing of the house setup and at about 40% on 8.1 tb currently) ergo I don't pull the trigger on that buy as I can wait months to another year.
Apple can't, has to roll out the new devices for the masses. Taiwan says yeah...we quoted you that price last time for device X, that was then this is now. You got your iron clad contract price the last time....now THIS contract gets this price.
That and 9.7 had a different Gantt chart from 12. Welcome to IT...the first run of something often finds stuff for it successors. Found out things on the 12 to better apply on the 9.7. When I do server upgrades its the follow up servers done the best. First one you break your cherry on and find out many things in you plans that just didn't jive well with reality (Murphy saying hi) and that goes into production. You have lots of notes to make the others go better. You'd like to redo that first server but...its up and serving clients. It could have required extensive rework (ie. the web programmers are all over code for redirects to it) so there it stays as is.