There is so much to think or write about a simple “Store” tab. Something so “obvious” can lead to weird design decisions, even for Apple. I love this (rare) blog post from Ken Segall.
Sarcasm ON: “I’m feeling inspired by Apple’s new way of thinking. It’s liberating. Who needs “Apple” when you have “Store”? Generic is just so much easier, don’t you think?" - Ken Segall
To be honest, I don’t remember when there was a dedicated Store section on the Apple.com website. Apple brought it back, leaving “Buy” buttons scattered around every single product pages. It is now so much easier to buy something from Apple these days.