The non-Retina 13-inch model was the last MacBook Pro — actually, the last computer — that Apple sold with a disc drive. It also happens to be the last MacBook with storage and RAM that can be upgraded after purchase.
The part of me that loves a singular and complete computer is thrilled with the new MacBook Pros, but the part of me that has regularly upgraded my computers doesn’t seem ready just yet.
Update: Looks like the new MacBook Pros have a swappable SSD after all. My apology for being incorrect, but this is excellent news.