That would be an extremely niche use case. Can't imagine any scenario needing more than 2-3 x USB A ports outdoors. In any case it would make much more sense to use a dock.
We're talking about a laptop. What's the point of a laptop if you're just going to make it into an underpowered desktop?
And it's not like mouses and keyboards need a 4Gbps connection to the host. Plug them into a tiny hub. You're already lugging a keyboard and mouse around, why not a hub too?
I don't lug a keyboard and mouse around, but I'm very happy happy to have three ports on my Thinkpad. There are lots of other things to plug in - MIDI controllers, audio interfaces, macropads, microcontroller dev boards and debuggers, cameras and other capture devices. It depends on what you do with your computer.
My laptop is "an underpowered desktop" 90% of the time, but it saves me from having a second machine the remaining part of the time.
But I agree regarding ports - at home my mouse and keyboard are plugged into a cheap KVM switch, so I still need only one USB port on the laptop; If I needed to lug them with me I'd certainly just bring a hub too.