Is there a word for something or somebody who fulfils the unnecessary while not fulfilling the necessary ?
Example: Matthew is a handsome thief.
It is good but not necessary that he is handsome, which he is, but it is necessary that is he not a thief, which he is.
Or for example, a car that is water-proof, which is good but unnecessary, while the velocity meter doesn't work, so the car doesn't meet the required demands even though it is water-proof.
Or for example, a product that looks nice (which is not necessary) and doesn't work good enough.
Or for example, a person who is nice or nice-looking (which is not necessary) while being dishonest and thus not fulfilling the necessary requirements while being more than necessary nice.
Now I think that maybe a word for it could be suboptimization while not capturing the notion that you're actually failing the necessary.