What did we add that is “hyper niche?”
For taddr rotation, we need to solve a security issue that involves core, and core has been focused on 6.1 and Zallet.
If user receives funds to multiple taddrs and then shields them all at the same time, it reveals information to potential attackers. They will have some ability to determine that they are from the same wallet. For example, if the attacker sends funds to a taddr, they can then monitor when those funds are shielded and gain information from the other balances that were shielded simultaneously. There is some discussion about leakage minimization by spreading the shielding out over time, which could be a usability issue as the user cannot send funds from a taddr in Zashi.