I never really understood why people still adhere to the 3 character file extension limit when that is a throwback to FAT32 on pre-Windows 95 (and some very old mainframes which shouldn't be internet connected anyway). Yet some people still favor the 3 character extension despite it looking objectively uglier (as a dyslexic I do find them harder to read) and dropping a solitary vowel in a file extension saves you nothing in terms of development time / file size / etc.

So I honestly don't get why people still use them.

Extensions that particularly annoy me are:

    yml instead of yaml

Why do people do this when even the earliest YAML spec is much newer than the last of the systems that had a 3 character extension limit.

    jpg instead of jpeg

Nearly all of the .jpg's in the last 10 years would be too large to load on any systems that couldn't handle a 4 character extension anyway. So backwards compatibility isn't even an argument here.

    htm instead of html

Similar argument as JPG except this time it's more to do with the HTML specification and browsers capable of rendering them.