You got to have some perspective on the enormity of the problem.
A forum that has been, from day zero, WYSIWYG is probably reasonably straight forward to build and would only take 2-12 weeks of development as a plugin, there are real challenges around quoting, but quite a few options to shop from and you can strip out lots of features.
However, a WYSIWYG editor that co-exists with our Markdown hybrid editor is an impractical project to embark on. Going back and forth from Markdown to WYSIWYG is just too big of a project, and would always cause annoying reformatting of Markdown.
As it stands we have huge amounts of debt with our editor we got to repay, multiple weeks of engineering are required to move us to CommonMark, this is where we are going to invest our efforts. It would spread us way too thin to be also building a “WYSIWYG” option.
I much prefer investing effort in refining our current solution than jumping ship. There are tons of refinements left: “synchronizing” preview, to interacting and resizing images in preview.