Exactly. They should have named them Air, Pro and iMac. That way you clearly can see which is fastest and which year they came out.
For years CPUs had numbers that went up: 286, 386, 486, Pentium.
After that, it was Mhz and Ghz that people used to rate a CPU.
But none of those things are as relevant as they used to be.
So what number goes up? i3, i5, i7, i9. That's what Intel is telling us. That's the number they want us to see.
> MacBook Pro (Retina, 15-inch, Mid 2015)
> Processor 2.8 GHz Quad-Core Intel Core i7
prettly clear there
How would you differentiate?