First of all these are not "official" (hence why it's a different organisation on GitHub) and all is maintained by community. It will take some time to port al

First of all these are not "official" (hence why it's a different organisation on GitHub) and all is maintained by community. It will take some time to port all the existing extensions, but the good news is that JupyterLab has been thought to work with extensions (actually everything in JupyterLab is an extension with no privileged component), so it will be easier to write these for JupyterLab than for current notebook. The documentation on writing extension is also way better than for Classic notebook, and we had new contributor writing extension in 2 to 3 hours. So we encourage you to try and send us feedback !