• MST (DisplayPort daisy chaining) in MacOS. The hardware has supported it for over a decade. The OS is the weak link here. It's the difference between spending $75-$300 for a dock in addition to the cables and just connecting the monitors together along with a single cable to the first monitor.
• Non-soldered storage. Seriously. Storage is the most likely component to fail. SSDs only have so many write cycles.
• BIOS on a separate chip. To make matters worse, with the introduction of the T2 chip, the BIOS is stored on the SSD as well. This means if the SSD fails, you don't just lose your data; you have an expensive brick. You can't even boot to external drive anymore if one of the two SSD chips fails.
• Safer SSD chips. If a cheap capacitor fails on newer Macs, 13V gets shorted straight to the SSD. The SSD commonly doesn't survive this. And since the BIOS is on the SSD now… Literal ten cent part blows up your multi-thousand dollar laptop with zero warning.