All of your examples are wrong, because you don't state WHY you think it would be better. Never give instructions without at least a short explanation.

Better tone of the above sentence, without "blame game":

    None of your examples include WHY you think it would be better to do something. I never give instructions myself without explaining at least briefly why I think my suggestion is better, because they more likely understand the problem or accept my suggestion.

Even if you think something is better only because your taste, it's still better to explain yourself, so you can agree to disagree. I usually let go small things if something is readable and functionally not different.