I'm not a climate scientist, so I can't really speak on the science itself. Like you, I've read scientific studies supported in Nature and in Science and supported by the IPCC that indeed show that gas may not be a transition activity in the way that it was considered to be before. Even in the EU taxonomy, you have relatively strict criteria.
To answer your question more directly, I would go back to one of the points made by Professor Damodaran about psychology. If we set a taxonomy, as I think Mr. Beaulieu said, it's a sort of a green label. If we set a green label, everybody would want to have it, especially those who are undertaking greenwashing.