scimax VS org-mode

Scimax should have out of box setup for bibliography, references etc. Anyway, regardless of what you use Emacs for, one step a time, would be my recommendation. Just start using it and solve problems as you experience them. It is better to add a single thing at a time when you need it, than to add 1000 different things because you think you will need them, and then not know what you have or what causes a problem.

https://github.com/wdavew/org-excalidraw is close. I discovered you can install Excalidraw from Chrome, and then it is like a local program. That is pretty amazing in itself. org-excalidraw indeed offers an org-link and way to make an excalidraw file from emacs, edited natively in an external excalidraw window. The svg preview does not work though if you use freehand lines in your image, and I was unable to install the npm packages on my Mac for some uninteresting reason related to DNS, but it did work in a node docker image. I find writing in excalidraw less advanced than in tools like Notability or PDFExpert. There are some artifacts in excalidraw from smoothing, or dangling pixels that I don't love. I forgot I had previously used https://github.com/lepisma/org-krita. Krita is a full drawing program, and this integrates into org-mode with image previews nicely. I am not that skilled in using it, and as a full drawing program, it has a learning curve. I wrote https://github.com/jkitchin/scimax/blob/master/scimax-inkscape.el to integrate inkscape into org-mode. It works, but I find inkscape slow to open, and I am not that skilled in using it.

Maybe give scimax a go?

Anyway, if you want something geared toward scientific usage, there is Scimax by J. Kitchin. There may be some others, but I am not aware off.

Apart from the ones already mention, John Kitchin's science-focused Scimacs is also an option.

Nope. Though Emacs does support dnd. Someone is to dig into the weeds of the Emacs dnd API and to implement dnd support in Org. Patches welcome! See https://orgmode.org/worg/org-contribute.html

It would be even better if you turn appropriate parts of the article into a patch to Org manual. We currently lack detailed description of citations, unfortunately. See https://orgmode.org/worg/org-contribute.html

Yes, this problem should be present for everyone using the same version of org-mode as you are. From a quick look around, it seems that this regex was committed in 2013 in commit 5f095f59099e77eda5cf7cae64119f9f246c4c70.