In what sense? Putting that much power down a USB cable? USB-PD keeps the potentially cable-melting amperage capped at 3A or 5A (the latter only if the cable is explicitly marked as 5A capable) and moves more power by increasing the not-cable-melting voltage instead, so 100W is 5A at 20V. There's already laptops which charge at 140W over USB-C, it's fine.
It's a lot of energy. And close to signalling wires. Controlled by computers (What you describe is done by a CPU, not some simple foolproof system, I guess?) which can go wrong. In a small plug that can get yanked out easily and damaged.
That kind of thing. Am I being paranoid? It just smells like a house fire in the offing.
There's a lot of moving parts yes, but in practice it's proven to be pretty safe. Issues usually manifest as charging being too slow, rather than going too fast and causing a fire.
Whenever you charge a device you're already trusting a complex computer-controlled system not to turn the lithium ion pack into an incendiary device, trusting a computer not to overload a copper cable is small stakes relatively speaking.
Of course it can. It is not tested by any of the devices, it is returned by cable itself. Cheap cable maker can just program cable to pretend to be more powerful one but not have wiring up to spec:
> Sources Shall detect the type of Attached cable and limit the Capabilities they offer based on the current carrying
capability of the cable determined by the Cable capabilities determined using the Discover Identity Command (see
Section 6.4.4.2) sent using SOP’ Communication (see Section 2.5) to the Cable Plug. The Cable VDO returned as part of
the Discover Identity Command details the maximum current and voltage values that Shall be negotiated for a given
cable as part of an Explicit Contract.
Please don't talk about stuff you have no idea about.
higher voltage makes it a lot more sane, imo. if anything increasing the voltage a long time ago would've probably helped us avoid the plague of all these shitty under spec USB cables. the cynic in me says they would've just shifted to even thinner gauge wires, but hey, a guy can dream, right?
