@prog said:

perhaps posting youtube videos should be a core feature, which can be disabled if not wanted?

Definitely not.
NodeBB is meant to be highly plugin-able. Even markdown-usage is a plugin.
At most it would be added to shipment-dependencies therefor it's installed on fresh installations by default.
I don't consider it as important, especially since there are so many sources to embed things from it wouldn't be correct to favor youtube. But the latter is just my opinion.

I'm still in love with the tabbed view it's pretty cool in combination with shortcuts that you go to preview after one press of Ctrl+Enter and submit on second press the Ctrl+Shift+Enter was a quick way to get back to write...

At least on mobile devices (small displays) the tabs should come back (I don't use mobile devices but tiling window manager so I experience NO PREVIEW at the time with only one other window when horizontal aligned).

Maybe it's even nice to have the 'submit' button first show the preview and another click does the submit.

In general I'm against any WYSIWYG since it's annoying for experts.

@Mega Ah, my fault. So the real post-parsing works by calling the composer.renderPreview socket-id? because the search for filter:parse.raw doesn't show up any other possibilities just curious.

EDIT: my mind is tricking me out. please ignore

Since NodeBB uses bootstrap there sadly should be support for IE 8+ (source).