I can understand the warranty aspect: they don’t necessarily want to be in the hook when users stuffs up the port using a janky 20-in-1 USB-C hub.
Why play around with the VRR and HDR side of things too?
Edit: I know someone will say ‘because they want to sell more docks’, but it already comes with the console… the market for people buying multiple docks I doesn’t justify the development and manufacturing costs.
Nintendo is not making a USB-C computer, they're making a _product_ or a cohesive system.
They do not want you plugging in an arbitrary charger (which may not have the right wattage), don't want you laying the switch face up (nubs on the controllers getting in the way), face down (scratching the screen), plugging in a usb-c controller and dragging the spiderweb of wires off the entertainment center, or trying to use the touch screen while attached to a TV.
They wanted a vertical dock that managed airflow, charged at the appropriate rate, and guided you away from asking why you couldn't have some janky setup where you're trying to treat it like a gameboy advance (local screen simultaneous to big TV) being held by kindergarteners who pull the TV off the stand).
...so the dock is effectively a sacrificial buffer/safety system to prevent your switch from causing damage to your TV.
Why not? The standard deals with such a situation fine… There is zero danger, the PD contract wouldn’t be able to negotiate, so the system could just indicate with an LED or a message on the screen or something to show it’s not going to be able to start charging without a bigger charger. This is literally a solved problem.
DS Lite famously had a silly proprietary connector for charging, which required their special wall charger... which was literally a 5V charger. It could have been mini/micro USB from the beginning, but no.
Claude used to work best IMHO but their “safety” change has made it near useless. Luckily local models are getting better.