Just leaving this here as an idea if anyone wants to pick it up.
IPB uses CKEditor as a WYSIWYG editor in their software. Turns out it's fully open source and could be a great addon for Elkarte.
http://ckeditor.com
IMO, the current one we are using here is much lighter and much better. CKEditor has a lot of bloat IMO.
This is the one Elk is using:
http://www.sceditor.com/
I've never looked into either, but I think you're right, SCEditor does look at lot less bloated.
Without having Elk's JS hooked up on my theme, I didn't even know a WYSIWYG appeared lol.
Well, SCEditor is a bit heavy on the CPU, especially for old computers (like the one I'm currently writing from, an atom N450).
From an IPB website, CKE seems a bit more cheap.
SCEditor also loads quite slow on phones and operates fairly slowly too.
Never had a problem with the editor on my phone or tablet.