That's debatable. There's actually quite a few characters you can kill off in the Corruption path, just to gain more corruption. So far, choosing not to kill some of the characters seem to make a difference. Sparing Danica makes it possible to succeed in the B rank Hunt, and earns you Danica affection. Historically if you can build Affection on a girl, then there will eventually be H-scenes with her. Sparing Jake seems to make it possible for Mia to fully regain her memories at the Bonfire event. Not killing Christie is mandatory to avoid a Dead End. Not killing Demi keeps her path open & is required for the Clover Demi H-scene, Sparing Clover (from Death or jail) grants +2 Demi affection & is required for the Clover Demi H-scene. Not killing cops during the Mall event is required to unlock a later Brianna sex scene It's speculative, but I would not be surprised if saving Laurie, a superhuman with CC abilities, and special requirements to save, winds up paying dividends in the long run. Not unlike beating Valravn without Brianna's help.
What you're saying is purely speculation. There are other points in the game, particularly on Corruption path, where you get a Dead End, but also a lot of interesting lore. I'm referring to the early Ella fight where you actually beat her and you encounter the monster that turned you into a Superhuman, and then an Unknown entity kills it, surprising even Ella. The other case is the Lvl 3 evolution, where it's possible to ask the Eye entity a question, get denied, then say Yes, then die and come back for a lot of interesting lore. In both cases, there's no payoff to unlocking it (aside from the exclusive Ella sex scene), because you obviously die shortly after, but it's the only way to get that lore.
Overall, I think the rewards for keeping certain characters alive and getting the best ending from fights has a bigger payoff than collecting lore. And it will probably continue to have a greater payoff moving forward. So far, the game has snowballed the effects of good choices even from early game (like the 1st Michael fight). Those small advantages and choices wind up making a big difference in major fight outcomes. I would not be surprised if the story's true ending, depends on getting ideal outcomes and meeting very demanding stat cutoffs.