https://developer.mozilla.org/en-US/docs/Web/HTML/Element/form#attr-enctype
Here I find that "text/plain" is only used for debugging, but no further information is available such as why it is only used for debugging.
When I try this with "non-file" data it is very practical. Everything is separated by a "new line" and are easy to handle.
What's the catch? E.g Are there characters that can create problems?