Why not always use enctype=“multipart/form-data”?

Question

When building HTML forms why do we not always use enctype=\"multipart/form-data\"?

Answer 1

With PHP it doesn't matter what kind o enctype the form had. You always get key/value pairs.

So if harder coding is the only reason not to and you are using PHP, just use enctype="multipart/form-data".

Is there any other reason?