Right. Currently we have a choice of emails that look like a single line as you compose, or emails that are truncated on EVERY line at 78 characters (or whatever you have set). The first option creates the right email - but it is tough to create originally. The second option is easier to create originaly - bit it creates the wrong final copy.
What the world is used to is the option to have
dynamic word wrapping. It is a standard in any HTML-based editor. In effect, KMail has forced a <br> after each 78 characters which is NOT what most people are hoping for in a word-wrap feature.
It isn't a bug... it's just a feature that some of us find questionable.
Take the HTML editor we are using right now in this forum for example. You do not type your carriage returns or line-feeds, they are dynamic. If you want you MAY create a "hard-return" by pressing the ENTER key. THIS is what most consider to be the norm in email creation.
Did I just make a simple question more complex?