They can't. If Bungie release something legitimately strong that isn't just handed to you, that you genuinely have to try and grind for all it does is enrage the community.
Even though things like lighthouse adepts and GM adepts are much much more casual friendly then they were when they were implemented, there's an extraordinarily high amount of players that will simultaneously not practice or try to take the time and improve to earn them. Instead they'll flock to anything that gives them a voice (this forum, Reddit, twitter typically) and scream endlessly about it until Bungie cave.
Now I wanna make it clear that there are lots that won't act like that but the ones that do are the loudest
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Also pardon this second comment, we now have SBMM so those players would essentially never match with people who use adepts.
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It doesnt have to be a perk that breaks the entire game, Exotics already take care of that and every Ace player who hasnt used any other HC can attest to it. No, instead something unique that at first might just be a gimmick with interactions with our class kits, that if worked into, can evolve playstyles. Which sounds 10 times more fair than an immortal, Terrabah or Ace 2 tapping with one of the best base stats ever.
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I agree, I wouldn't want them to be game breaking either. The only thing I want is the reward to respect the grind. As in the hardest things to do in the game should give the best loot, doesn't have to break the game or be the only good option for it's respective slot just good enough to respect the effort it took to grind it