This post is about Inkscape and Inkscape svgs dont have any edit history baked into them. If you had a dozen revisions and one of several collaborators sends you a suggestion version which they edited from some unknown revision what would you do with that? The file itself doesn't imply what deltas they made, and "copy paste" doesn't make sense, since what would you even be copy+pasting?
Yes, I honestly think that if you have collaborators doing edits forming a DAG of derived artifacts, and you only observe a subset of those artifacts that you can't take some arbitrary artifact and merge that correctly with another arbitrary that opaquely branched some point in the past. And that is what consistently happens with the "just email some zips of the documents" collaboration flows.
Git helps by forcing the deltas to be knowable, but at the expense of a complex management tool and only really working on text based source. All other modern software now solves this problem by being online collaborative which eliminates the problem entirely, and that benefit dwarfs any other feature for most corporate/organizational usecases.
Inkscape is great software, but it's not acceptable software if you're going to collaborate with multiple other people who will all be making edits to the same document.
