Indeed, it doesn’t explicitly create such linkage. But even exposing just the amount could indirectly create linkage to identity and actions, due to auxiliary information or common habits.
So it would be good to have migration tooling that mitigates leakage of even the amount, as was the case for the Sprout-to-Sapling migration function in zcashd. And figure out how to integrate it into light-wallet/mobile apps.