It sounds like we have the same issue with the game, but are attributing it to different reasons though. You think the infusion is bad, where I think the entire progression system is awful. Infusion isn't a problem as I see it. Everything except "powerful drops" dropping at 20 levels below you is the real problem. If we just had softcaps for activities, say strikes can drop up to 680 and endgame stuff drops up to 700, then you could get a ton of gear sets at endgame level without having to infuse.
My point isn't that the system is perfect how it is. I simply think enhancement cores drop so often it's not an issue to get them for infusion. And that infusion isn't necessary for anything in the game. Power level gives you literally no advantage after 650 in any activity but the reckoning, so infusion is almost entirely pointless. It won't even matter in iron banner because of the new buff.