Are you referring to the 5400rpm drives recently used? Or spinning drive tech in general? SSDs don't yet have the capacity that many consumers demand, so a balance needs to be struck.
I'm wondering how happy people are with their 5400-based Macs. Did it turn out to be a non-issue?
Regarding Lightning-based headphones, I do agree that Apple needs to streamline tech across all platforms simultaneously. And if they are going to go the proprietary route, bring that to the Mac, too. Imagine if they simply used a Lightning connector on the new MacBook instead of USB Type-C? Or if Type-C is so great, why not drop Lightning entirely and just use C across all products? It's this patchwork connector tech that creates the mess and consumer confusion.