The examples given on the page seem to focus on multipath to get to a device over the internet, but I can see this being more likely to work properly without needing to fallback on home networks.
With multiple ISPs, or on a complex enough LAN, we can use multiple routing tables + weights too.
Also, if the ISP at home can do 10Gbps, 1Gbps, 300 Mbps whatever... I want to be able to use them with a single path, so there is no gain using multiple paths. Eventually, when I have cable+wifi connected at the same time, I use to force one of both, cannot see a reason to prefer using both at the same time.
Maybe the latency thing? Never had that issue at home, but could understand that usage case "just use the network segment with less latency to reach $thing".
MPTCP can also be very interesting for mobility use-cases, even when one network is used at a time, e.g. switching from WiFi to cellular, or different cellular networks in the train, etc.
https://community.fortinet.com/t5/FortiGate/Technical-Tip-Ho...
I don't understand why you would want to be able to use them with a single path. the gain would be being able to aggregate them and have individual tcp streams faster than any one IP connection could handle.
Though personally I think the resilience is more appealing. Not having to have a hard cutover when wifi degrades as I walk away would be nice
So, If I already have a 10 Gbps path to the router, I don't want to add a 300 Mbps failing air path added to my way to the router.
In the context of the parent (at home networks), I think most people has two paths... WiFi or RJ45-UTP. And with that multipath setup (WiFi + RJ45, I don't get why other comments are talking about cellular networks "at home") is not usual to walk away; right, you could walk, as far as long is the rj45 cable, but...
To keep HA on WiFi when walking around, there are other technologies more battle tested than MPTCP.