The point is not in losing value.

As far as I have understood, the point is that a future soft-fork could standardize the usage of the annexes and made older ones be unspendable.

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You are very hypothetical. With such mindset we should not use utxo because future soft-fork could change utxo and made older ones be unspendable.

Well yes, it's indeed an hypothetical risk.

However, annex was consciously left unused to be able to decide later how to use it. This means that the plan is for it to actually be used in some ways in the future. That's the point.