They're not meant for code.
Well, depends on who is using it.
For the average MODXer nothing is meant for anything but that which is meant for either by intention or restricted purpose. (wut!!!?)
I (and hundreds of users) use TinyMCE for code and strictly for it, so go figure...
When I say "TinyMCE", I in no way refer to the Extras in the repository that misleadingly bear that name as exactly theirs.
Using the real deal since 19..