I noticed this when I clicked the enter key in Visual Editor to separate some stuff I was working on in my sandbox. This is a bad idea.
People have come to help pages such as en:Help:Sorting on English Wikipedia and tried to replace all <br> tags with <br />. We had to revert all their work and explain to them that we are trying to make things simpler for editors, not more difficult.
By the way, why is this editing window making editing more difficult by not having a button for nowiki tags as in Wikipedia? Developers should be trying to make things easier. Now I have to go to an editing window on Wikipedia to find the correct nowiki wikitext, copy it, and then come back here. I often wonder where to put the slash. I don't have this stuff memorized.
And this crap editor keeps messing up the nowiki tags I try to enter.