but you can't lose huge amounts of money watching kitten videos or ordering a pizza.
Trading isn't for everyone.
And most people understand the difference between a fluctuating value and something you eat.
They also understand that a
dramatically fluctuating value causes them to lose buying power.
Making pedantic points claiming that it's trading or that the price in fiat shouldn't matter would be meaningless (you're not quite saying that but implying it). You could use the phrase "buying power", and it would mean the same thing.
Besides, many people are in Bitcoin to get more fiat. It's a shame, but it's true. We're waiting for real merchant adoption before people will stop paying attention.