I'd dislike it if zooming was disabled completely. However I also dislike having to keep zooming out after every post. Is there a way to make it so when you click in the editor the editor does not expand to cause the page to enlarge?
It looks like we can disable zoom if the input has a text size of 16px or larger so I'm experimenting with applying that for iPhones. That said, it may not stay - it can always be applied via a style property if desired.