Earlier quoted context omitted.
I think the difference is that currencies fluctuate against each other, whereas if everything is priced in Bitcoin, its whatever you're pairing it against that's fluctuating. Goods (ex: loaf of bread for 200 satoshis for example) would stay stable
Humans are creativity machines. We are always expanding the amount of value there is in the world. The only way to have stable prices is to have a currency that inflates to match the amount of new stuff created. But do we really want stable prices? Today you can buy a device a million times faster than 20 years ago for the same price. Imagine if everything were like that.
And as you can see that massive deflation completely destroyed the computing industry, as everyone sat around waiting for next year's device that was faster and better for a similar price.
Wait, that didn't happen? People still buy things when there is deflation? No, that can't be, how else can I justify the morals of my money printer?