Personally I would say that is kind of a big deal, especially considering how well guardians getting friendly with the hive has worked out in the past, but apparently it isn't.
Honestly making a pact with Savathuns worm has had a bigger impact on the story
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It’s the details of the pact that matter. An agreement in and of itself doesn’t mean anything. The conditions and rules are what matter. That’s why it’s ignored. What was the pact? We spared the Worm and made it into a gun so that it could continue to live and we get a slice of the profits when we use it. So what impact does that truly have? That’s how normal guns work, except we get the power gained in full. So really, using Whisper doesn’t confer any bonuses to us and only benefits the low worm. Making it a trinket, not a plot device.