What’s the motivation? I don’t want multiple things reading the file if I’m not working solely in nodejs—I want one tool reading it and setting env vars for all

What’s the motivation? I don’t want multiple things reading the file if I’m not working solely in nodejs—I want one tool reading it and setting env vars for all the rest—plus plenty of tools already exist to do this and most are trivial to install and use, and overall it seems like another way for things to go wrong and just a platform-specific Yet Another X burning person-hours to… what benefit?