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> The fixed currency supply guarantees it

No, it doesn't. Bitcoin can lose 50% of its value in a matter of hours, as recent experience shows, despite being in a limited supply.

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So the only way bitcoin isn't deflationary is if demand for it continually goes down over time until it's irrelevant. If demand either goes up or stays the same, it will behave deflationary (wallets getting lost). This doesn't seem to be a good performance pattern for a currency.

You're right a fixed supply isn't enough to guarantee it, you still need productivity growth and technological progress, something we've had for a long time. Given enough growth a 50% crash is nothing.

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