Exactly; Steve Jobs envisioned a closed architecture for the Mac. Thankfully for Mac users who wanted a more open experience, Apple released the Macintosh II in 1987, which was styled similarly to PCs and had six NuBus expansion slots. From then until the release of the cylindrical Mac Pro in 2013, Apple always had Macs with expansion slots in its lineup. From 2013 to 2019 Apple didn’t sell Macs with internal expansion slots, but Apple resumed selling internally expandable Macs once the current “cheese grater” Mac Pro was released, albeit at a significantly higher price point compared to the 2006-12 cheese grater Mac Pro.