That's the beauty of real research. There's no guarantees it'll pan out. But it's generally worth doing and spending (sometimes decades of) time exploring. Too many people have become infatuated with instant gratification. It's pervasive even in young, scientific minds. The real gratification is failing that same test 100 times until you finally land on a variation that might work. And then figuring out why it worked.

Edit: And if that success never comes, the gratification is graduating and moving on to more solvable problems, but bringing with you the scientific methods you learned along the way. Scientists might spend their whole lives working on something that won't work and that's okay. If that isn't for you, go into product dev.

How does our biology affect the limits of what we can comprehend?

But here I am in this body, and not that one, so I'm content to accept an axiom or two.

I'm not proposing that gravity is underpinned by something complex, just that if its mechanism is out of our reach then so to are any conclusions about that mechanism's complexity.