I have not done these things when I had less money and now I think removing minor hassles with extra money is worth it. At another order of magnitude of money I'd definitely acquire multiple copy of things I need.
I love your go-to bag example which I wished to have but never did. In a weird way because I have more time to pack but not much resources or time to travel anyway.
Of the 261 words in your comment (archived at https://archive.is/Vfx9Z#selection-161.6-184.0), none of them mention that you see it as "grotesquely flagrant consumption", so reads like the meme about the temporarily embarrassed millionaire.
I will say, this no longer appears to me to qualify for the name I suggested a few minutes ago. Oh, the statement remains false, only I now no longer believe you competent to defame. Have you had a meal today?
It feels like a bit of a tautology, but I think has some reality to it as well. When you're steeped in a more frugal mindset, it can be hard to remain rational or detached when analyzing consumption patterns "just a few orders of magnitude" larger...
If I had to guess, I would say I've been braced by someone whose morning was complicated by treating "take with food" as a little too much more of a suggestion than an instruction. No judgment. Nothing I haven't run into before.
It's not about concurrent use at all. It's all about availability. I had my simple, trusty Logitech keyboard and mouse. And 2x more of each, in a box, in a cupboard. I'm not using them. But I have the comfort of knowing that if either fails, I'm back up again in two minutes. That, for me, is comfort.
Now, if I had two workplaces (for example home and the office) would I carry my hardware between places? If I can't afford to buy two of them, yes. But if I can afford to pay 20€ twice, I'll have one keyboard at home, the same keyboard at the office, and so. That, for me, is comfort.
Now, scale the keyboard for 20€ to a Lexus for 40k€. Same thing.
But that's what makes it "weird". Most people can't afford to do that. As you point out, it mashed a certain amount of sense, but we're in the midst of an housing crisis. People who have enough money to own, not just multiple houses, but so many cars that they got tired of different cars so they just bought more of the same? Weird because I've never done that.
How many iphone 13 minis have you used concurrently, and in how many different locations did you own them? Byb your own admission, you only use one at a time.