A noble goal, but you are possibly making it worse for many people with this additional work, with no clear upside.

Should I read your long comment, I'd prefer being able to chose the width at which I read it and take advantage of automatic wrapping.

If you manually enter line breaks at column 80, suddenly you are making it impossible to read with a higher width, and completely breaking anyone reading on a screen/window with a width smaller than 80 characters (taking zoom / character size at comfortable reading level in account). You are forcing a fixed size on anyone, basically.

You work against your goal by forcing line breaks at an arbitrary position, and doing more work for this.

Just let the reader's software handle this in an optimal way for the reader's situation. You can't yourself because you lack information about the reader, which can change and their can also be several readers, each with their own situation.