It’s tedious to type when you want to do `ls *.mustachemingle` or similar. It’s prone to get cut off in UIs with dedicated columns for file extensions. As you

It’s tedious to type when you want to do `ls *.mustachemingle` or similar. It’s prone to get cut off in UIs with dedicated columns for file extensions. As you say, it’s unconventional and therefore risks not being immediately recognized as a file extension. On the other hand, Java uses .properties as a file extension, so there is some precedent.