WayOfTheFourElements
Hero
As usual, you can negotiate whatever you like for your table, that's how the game works. However, sneak attack is a specific 5E mechanic, with specific mechanical effects. If you want to change that via tags and negotiation with your players you can, but that doesn't change the fact that you're making that change, and that has nothing to do with the mechanics as written. Your table rules aren't germane to a larger discussion about how sneak attack works, other than as an example.
I'm not so sure. I think it has everything to do with how the game is written and read: if the game is interpreted in terms of continental (Roman) law or (British) common law (in their Platonic forms).