Well probably main because there's no reason to allow it when there's equally good and vastly safer options out there. No need to change the rules to allow for the use of something that you know for sure will lead to random morons making a simple mistake and burning down a house or an entire neighborhood.

As for why it got banned in the first place I mean if we're nice the above is a likely explanation, if we're realistic probably a few accidents happened and it got in the news and the politicians realized they could score some easy points by amending the code and seemingly be "all about safety" without actually doing anything actually useful.