Pixel 7 worth upgrading from one plus 8t

For the camera, I'd say so. Plus, it's a newer device so longer support.

I came from a 7t to a pixel 6 and the camera jump was massive. I suspect its similar in the jump. I've always felt the pixel cameras (3xl, 4 and 6) have been superior to the oneplus versions I've had (5,5t and 6t)