Do you think Spark and Ark require comparable fees to exit unilaterally? Have you seen a similar study for Ark? This data liveness requirement is painful but I think comparable to the pain of expiring VTXOs in Ark. There you already always have the state to publish for the unilateral exit but you (wallet or watchtower) must monitor the expiry deadlines. Of course the other thing is that ark operators are less trusted since they cannot conspire to steal funds. However I still love Spark because at the end of the day operators don't have enormous liquidity requirements and this will make a big difference in adoption. Also in Ark has that constant periodical refresh from user wallets, that doesn't look good to me. I don't necessarily open my wallets every month and this is going to be a problem when a lot of users realize this (or have to pay extra for a refresher service). All in all love the innovation of the L2 space