The mad quest for ultimate thinness—that I don’t recall anybody ever asking for—ruined everything. The MacBook peaked with the mid 2012 MacBook Pro: upgradable memory, upgradable hard drive, swappable CDROM, lots of ports, and a great keyboard. The perfect laptop. Mine soldiers on with its RAM upgrade and swapped-in SSD drive as my iTunes and Photos storage center for my phone, and has only recently started feeling slow to use.
I have newer computers, but that will always be my favorite.