Unfortunately radio take a long time and a lot of money to get approval for, and the process is different for every country. And it's the entire 'system' that needs approval - you can't just say the chip is already used by everyone else.

That's why your laptop will often have the wifi+bluetooth model as a little simm card under a cover, it allows them to get the radio 'system' approved separately from the computer and use the same radio in different models without repeating the process.