boglehead here. Switched off of Wealthfront awhile back. AFAIK they wouldn't outperform a three-fund portfolio.
I actually wouldn't mind a platform that uses my brokerage as a backend and lets me do % allocations on 3~4 funds, automatically identifies rebalance opportunities and tax loss harvesting. Basically nudging me like 3~5x per year. I'd pay a flat fee to do that.