No, that's not true, if you buy a walkie-talkie, the seller has all kinds of obligations to ensure that it follows the requirements.
Radio devices are a good example where it fact is illegal to make, sell or import transmitters that do not conform to permitted RF bands.
IIRC in USA there is an exemption in FCC rules if you're importing a device for personal use by e.g. buying it online from abroad (and then you're responsible to use it properly), but if you'd want to resell that device, you can't just transfer the liability to the user, you are responsible for ensuring that the transmitter follows FCC rules.