Like, you can see a leaf on and think “wow, that’s a beautiful leaf”. You may even pick it up to admire it (especially if you’re a child or a biologist). You wouldn’t do that with a strand of human hair, a human nail clipping, or even less with the parts that aren’t supposed to come off like hands or eyes.
That’s also somewhat to do with the concept of fetishism. Most people have never fucked someone without feet but it’s not a fetish until you start all but ignoring the rest of the person in favor…
And if someone does fuck a person without feet, it’s gonna be assumed that’s the primary reason as opposed to any of the parts the footless (or… footloose? Sorry) person does have.
Humans are weird.