I understand that the more time passes the greater the accuracy and yes no one uses zcash.
Discussion
With Ring Signatures the more time passes the greater your anon set becomes because your real outputs will be selected as decoys for other real transactions.
And like RINO said, *amounts* and *recievers* are still completely hidden. Only sender privacy is effected by this. The transaction graph is still hidden (connections between senders and recievers).
Monero made a great decision to have layers of privacy. If one layer is compromised the others are unaffected.