The rule of thumb is that most languages are rarely used (since there are a finite number of users), so if you support only the most used languages you necessar

The rule of thumb is that most languages are rarely used (since there are a finite number of users), so if you support only the most used languages you necessarily drop support for most languages. Then depending on exactly how popular a language must be to be supported you could end up breaking language support for quite a lot of them.