Why noses?

If I were to design a 'replicant' that's 'just like a human' (groan - this trope is so silly and exhausting), I would make sure they're MARKED in some way.

Detroit Become Human (a nonsensical name without punctuation) has a really silly way of doing this - a thin, flat, superficial ring of light that can be easily removed without any consequences to functionality (shouldn't be possible if designed properly).

Think about how difficult it is to design, model, render, texture and manufacture a functional (even in some humble way) nose. Why would they go through this trouble for a 'replicant'? Why not just leave the noses out.

Just make the face flat where a nose would be on a human. BAM! Instant mark that's very difficult to cover - you'd have to somehow acquire a false nose that looks realistic, and be able to blend it in with your face and make sure it looks seamless and is the same color. How many replicants would go through that trouble, and how easy would it be to detect that this has been done? Probably extremely easy in laboratory conditions anyway.

No need for extensive, expensive, prolonged and dangerous 'interview', when you can just check the nose area.

I think this would be the most organic, sensible and logical way to 'mark' (almost like 'non-mark') all replicas, without having to to through extra work, and without the mark being easy to remove, etc.

So why make realistic and functional noses for replicants? I don't get it.