Honestly IMO this kind of thing just depends a lot on tone. “That won’t work because” tends to piss people off and they usually do the thing anyway. “Cool idea! What about …? We tried … years ago and failed because of that” works at least sometimes (and sometimes they have a good answer)

Edit: also, bluntly, sometimes objections have answers that can’t be said. “DevOps won't want to support another service.”…”that’s because our devops engineers all think you’re an overpaid jackass and are strongly inclined to reject your ideas out of the gate. My one other idea they liked, so they’ll probably take a chance on another one.” What’s hard but important to remember is that sometimes you’re the person that things can’t be said to.