Agreed with a lot of your points but keep in mind that there was no new Mac Mini in 2015 and 2016 and many people thought there would be.
Many people thought they would in 2015 because they didn't have a clue what Apple was doing with the mini (extending the life cycle). And to be honest, none of us know what they're doing entirely. It's the same reason that many people thought we'd see a 13" MacBook Air with Retina display but in the same body. They aren't really looking at Apples thought process for the future. The mini should have received an update this year but I think timing was the main boundary.
Of course, you could be right and Apple could decide to leave the Mac mini for another year. We'll have to see what Apple choose to do after the complaints about the Mac. Hopefully it's a much needed wake up call for them.
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Not all i7 are Quad Core. We are hoping to find a Mac mini that is actually better than the 2012. And at the same time, hoping that the HDD, SSD and RAM and be upgraded in future if needed.
I guess that is too much to ask for in Tim Cook's reign.
https://browser.primatelabs.com/mac-benchmarks
Yes I understand, I think many (possible ex-)Mac mini buyers, including myself, would like a quad-core option and upgradeability. The 2014 Mac mini is a direct result of Tim Cook being there, just like the extended upgrade cycle of the Mac mini and Mac Pro.
To have upgradeable RAM on all desktop Macs should be standard, and upgradeable storage should come with that too.
Although nowadays you can have really fast external storage and external graphics cards, so it's not as important as RAM/CPU. Nevertheless, I don't think storage should be soldered on in any case other than the 12" MacBook as it wouldn't be utilised my most of the market and would affect the form factor.