The trick is to get them to make the right decisions, but think about their idea. :-)
You cannot easily communicate with them in this thesis, but you can turn them around and direct them towards righteousness for each individual decision. In the end, after you go through this a few times, they will begin to trust you.
If possible, it helps to wait a day . Tomorrow they may be less clear what exactly they requested. (Do they really have a heart on the glowing logo, or is it just a whim?) Then, in your answer, you: tell us what you recommend and why. Repeat the agreed goals and show how the solution meets the goals. And it sounds like it was their idea . ("What you did yesterday about xxx is really excellent, and I think it offers a yyy solution.")
At this point you have a choice. Ideally, you can pretend you never heard their silly offer. Or, if you feel that you need to, respond tactfully and explain the costs. ("I’m a little worried about the idea of an animated logo, because it may not convey the brand image as you requested. Of course, if you want to go this route, we certainly can - and in this case I would suggest that we contact our graphic design consultant. Let me know if you would like to further explore this and get a quote from the consultant for his services. ")
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