Modern macOS restricts access to these kind of things without the necessary permissions, and as much as possible, Alfred is an "opt-in" when it comes to giving permissions... so I don't think I could make this work as standard default behaviour, which is imperative when it comes to such a fundamental action.
To re-phrase, for such a core feature, I'd rather do a single simple API call to open an app, matching Spotlight's behaviour, rather than go through logic which could potentially hold Alfred up making Alfred "slow" for the every-day user.