Someayouse must not ever ride down mountains, lol. 😉 Trust me when I say, there are times when you NEED that largest chainring. Coasting downhill is my preference too, but if there's a truck coming up behind me, intending to turn off a busy road, at the same time as I'm crossing his turnoff, I need to either pedal the heck out of his way quickly, or slow down/stop till he gets past. I don't want to lose all my speed, and time, so I'm happy to shift up & pedal harder for a few minutes. 🙂
And don't forget critters. Suppose a bear started chasing you, for some reason. Do you really want to spin out, with no higher gear options, and become lunch? 🤔😁😉
You might hardly ever need the highest gears, but when adrenaline kicks in, you want your machine to back you up. 😎