2020.1.b.15
3 out of 8 packages in the package manager window are for script editor support.
I’ve removed them as two are for microsoft studio and the other for jetbrains, I use Atom.
Question1: will removing these hinder any functionality between Atom and Unity?
Question2: are the packages for supporting Unity’s importing of .cs or for the Editorss writing of the .cs?
Question3: Is it beneficial to have multiple packages for different script editors or am I supposed to pick one that makes the most sense for the editor I’m using and remove the others?
Thank you
1: AFAIK no, they only affect their respective editor
2: You can see if Atom is providing a custom one, Unity only has official integrations for Jet Brains, Visual Studio and Visual Studio Code
3: There is no negative impact AFAIK, I usually work with team members that use different IDEs so I always install all of the available ones and had no issues with that so far
EDIT: I misread your question 2, if I understood correctly, the answer is that the IDE packages are basically for the scripting debugger integration (and a couple more features that may relly on the IDE-Editor communication)
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As far as I have noticed, no. I’m using MonoDevelop and I systematically remove all the packages; no problem so far. 
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