I'd like to hear both sides of the full argument please of that's a real offer. I don't think he was useless, but I do think there must have been better choices for the task
I once argued that Gandalf, with his mastery of magical fireworks, should have worked with the dwarves and elves to make a single stage rocket launcher with the ring as a payload. The Soviets made single stage rocket launchers that could make it the roughly 300 miles from Rivendale to Mordor, so I figured with the craftsmanship of the dwarves, the light and strong materials of the elves, and Gandalf’s magical fireworks they could make something to go at least a hundred miles. Then he could get on Eagle back, her high enough up for a good trajectory and fire the ring straight into the lava before Sauron could even focus on the eagle popping up on the horizon