There’s a difference between “suggesting” and “ordering,” and it normally is based on how insistent one is about what they think should be done. If you think it would be a good idea, but will be fine with whatever the final product is, then that’s a suggestion. If you think it’s the best idea, the only idea, and you won’t be happy with any other result, then that’s ordering. If you’re a client, ordering is fine, because you’re the one with the money. If you’re a friend popping in to look at what someone is making, or trying to “help” someone come up with ideas, then please, don’t do that.