Like those self-installed USB-chargers that are directly connected to your car battery. Can work sometimes, but you need robust devices. Probably a side effect

Like those self-installed USB-chargers that are directly connected to your car battery. Can work sometimes, but you need robust devices. Probably a side effect when USB-PD was introduced and people neglected the facts that there needs to be an elaborate handshake for anything other than 5V. Previously we always needed to check non-USB chargers for their voltage and there were connectors and adapters for different sizes. But now you need to be more careful with USB as well.