For what it's worth, it sounds odd to me. Part of that is, presumably, because "I want" instead of "I'd like to" in connection with something directly involving the interlocutor is rather forceful, likely inappropriately so. But even "I'd like to know how you are doing" comes across as weirdly and artificially sincere, which I suspect gets interpreted as evidence of low social skills, hence reflecting negatively on the speaker. I wonder if this is a trap that all attempts at solving this linguistic problem are bound to fall into.