The value of cryptos are measured relative to USD and are highly volatile because they’re based on subjective predictions of what the value will look like 10, 20, 30 years in the future.

Indeed. It's a vehicle for speculation (aka gambling), not a viable currency.

The Fed doesn’t control the value of USD beyond their ability to manipulate its supply, which for the most part only serves to devalue it. Meanwhile, crypto supplies are algorithmically deterministic

Then it's doomed to deflate endlessly. A quick look at the Great Depression should tell you why that's catastrophically bad. The Fed keeps the USD inflating for a reason.

It’s a very poor comparison and TBPH shows you don’t really understand the fundamentals.

No crypto bro has any business lecturing anyone on economic fundamentals. Especially not one who seemingly doesn't know that deflation of the main currency is to be prevented at all costs unless you want to see bread lines.