I love this kind of thing, shared reinforcement of theme+mechanics. One of my favorite RPGs, 7th Sea, has a version of this where a hero can use a token to get 1 bonus die on their own roll but 3 bonus dice to aid an ally. Heroes are stronger together. All for one, and one for all!
We genuinely wrote a game where the message is “mutual support is the only way we can save the world” and we expressed that through bonus manoeuvres granted out-of-turn by other players