Wallet browsers are basically a symptom of the webapp era of crypto.

Smart wallets mean that we are trending towards apps with wallets, instead of needing a wallet for all apps.

Less convinced by their need now and in the long term. Easier to swipe between apps on a phone than to bounce between websites in a browser.

the important problem to solve is that you can have one wallet that you can carry between mobile apps like you do between website,  minimizing fragmentation.

AA unlocking new gas payment options could be pretty flexible if you could easily let a main wallet provide funding for app specific wallets. Maybe there's some ZK there to prevent revealing secrets or requiring more back and forward on chain