I would like to avoid my content comrades from being unhappy and overwrite changes. Can I skip content from JSS package?
Two options for this:
sitecore\jssimportby default), and will skip any items which that user does not have write access to. Out of the box, JSS applies a workflow to created content items which will prevent the import from overwriting items that have been edited, unless explicit access is given to allow overwrite again. Or, you can use the security presets provided by JSS to deny write access to that user entirely, or configure the item security yourself, if you don't want content imported at all.