Just because most people have nothing to fear from this exploit doesn't mean it is a "nothingburger". And one of the reasons the T2 chip exists is to help prevent people from gaining access to encrypted storage on a Mac if they get physical access to the machine.
Anyone that cedes physical access of their computer to someone else, voluntarily or by theft, would be in danger. The most obvious example would be people crossing into the United States.
US Customs can seize any device they like and search it when coming into the US. No warrant needed. And the owner won't be present during the search. It is possible other countries can do similar things. If you don't think that is a serious threat, fair enough, but there are a lot of people, such as journalists, that will consider this a huge problem.
-KeithP