A serious academic ventured into the Register forums? Flee, while you still have some sanity remaining!
I don't see what application MPTCP has outside of the mobile space. How many homes have two internet connections? So everything goes through one bottleneck anyway. I see the application for mobiles though, and in particular for smoother handoffs from mobile to WLAN and back. I imagine that's why Apple use it - it's not for performance, it's so Siri doesn't glitch out when you leave wireless range and transition to the new IP address on the cell net.