Because lots of things were stores of value that aren't anymore.
Can I interest you in a share of Bear Stearns?
And lots of other things that were stores of value still are.
Anyway I’m done with this, I don’t even have a horse in this race.
Because otherwise your claim for Bitcoin's ability to store value is circular. Bitcoin has value because it's supposedly a viable tool for commerce. But it's not currently useful as a medium of exchange, and it competes with systems that are far better than it.