I’m very confused. Because it seems like for you decision should not only clarify matters and narrow possibilities, but also eliminate all doubt entirely and prune off all possible worlds where the counterfactual can even be contemplated.
Perhaps that’s indeed how you define the word. But using such a stringent definition, I’d have to say I’ve never decided anything in my life. This doesn’t seem like the most useful way to understand “decision”—it diverges enough from common usage and mismatches with the hyperdimensional-cloud of word meaning for decision sufficiently to be useless in conversation with most people.
If “you can make a decision while still being uncertain about whether it is the right decision”. Then why can’t you think about “was that the right decision”? (Lit. Quote above vs original wording)
It seems like what you want to say is—be doubtful or not, but follow through with full vigour regardless. If that is the case, I find it to be reasonable. Just that the words you use are somewhat irreconcilable.