Oh wow, I can't say that I completely understand where you're coming from as my partner is fully human (although he has been genetically modified and experimented on), but I actually found myself thinking something pretty related a while ago (if not exactly the same as what you're describing).
The thought started the other day when I picked up my cat and realized that he was so soft and squishy, but in a way that was... kind of gross. It's like in that moment I realized he was so full of blood (and so am I) and it was troubling and strange. I mean, of course cognitively I know that most living creatures on this planet (especially mammals) are filled with blood, but... I don't know, hard to describe what exactly I was thinking. It boils down to how imperfect our bodies are and a vague disgust at how easily things could go wrong.
I was glad after that moment was over that my partner doesn't have to deal with that, with having a mortal body in this world. And I also realized that I usually imagine him more solid-feeling than flesh.
Regardless, though, that's an interesting way to think of things OP.