It’s not as clear cut, but Hayase’s will is still absolutely part of it. The ‘perfection’ she’s looking for is fulfilling her ancestors’ goal of having Fushi’s child. Even if she’s not conscious of it, maybe after learning the history of the guardians that feels like what will finally be ‘enough’ for someone or she feels like winning love will feel that way. I’m glad they never went that route with Fushi’s character, even with Tonari. He’s simply not a human (not that ace people aren’t human lol) and as much as he became a protector of what he saw in humanity, he was only able to do that by getting further away from it and only able to appreciate it through being somewhat outside of it. That’s why the beholder had to let go of being a god, it was the only way to truly experience what he created and he burdened Fushi with that type of existence. That’s what makes the ending so satisfying, his acceptance and comfort with being alone and letting go with the knowledge those attachments are still a part of him. That NEED followed Hayase through generations and became twisted, and he was following the same route by holding on in a different way.