With that in, now the Monaco integration is being worked on: https://github.com/jupyterlab/jupyterlab/pull/1382.
We all want stronger editing capabilities, but it doesn't make sense for the Jupyter team to get into the business of writing text editors (plenty of better folks doing a great job on that already). So we're just trying to make it easier to integrate other text editors into the everyday workflow.
Thanks Fernando, Brian, Min & team for everything you've done with Jupyter. Looking fwd to using Jlab soon!
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But yes, JLab is shaping up quite nicely, opening up a lot of interesting possibilities. For advanced users/early adopters I think it's time to start playing with it (and filing issues for anything that's broken/sub-optimal, we really want to provide a great user experience with it once we hit 1.0).