They should have explained the Sub-family (most often known by the trimester or
1/3 year segment) and how to use most databases to see how that has been
working for more than a decade, to identify models & their build specifications.
http://www.everymac.com/systems/by_capability/mac-specs-by-apple-subfamily.html
There really is no problem with how this has been done, nor a reason to change it now.
The perception precipitated by mass-marketing such as automobiles, and other wares,
tends to not tell people otherwise; but that's how it has been working.
Researching models, builds, and information on specifications ahead of purchase
to see how this works, is very documented across most databases openly available.
See & get http://mactracker.ca for a download spec database on many things Apple.
Many others exist online, and are helpful when considering a purchase or to discover
more about a product line, dates of marketing/build, updates & upgrade capabilities.
I'm surprised that anyone would think this was an issue,
the facts and nomenclature have been widely published.
Perhaps not as easily found from the Store page, though.
Good luck & happy computing! 🙂