Sure I can, now that I'm at my computer instead of my phone 
The miner needs to verify the entire block chain history because otherwise he has no way of knowing if he is actually on a valid chain or not. This has nothing to do with UTXO commitments, rolling root, or any other proposal. It's a basic, fundamental requirement of any consensus system: if the miners themselves operate in SPV mode (which you advocate), then anyone -- no matter their hashrate! -- can trick the network into mining an invalid chain. The attacker does so by mining a fork with invalid history and temporarily (by luck or 51%) overcoming the honest network. New miners coming online, or miners tricked into reseting their state then switch to the invalid chain This completely invalidates the SPV assumption and makes it unsafe for anybody to use the network.
"Rolling root" doesn't even make sense in the context of bitcoin, as has been explained multiple times by multiple people in your own thread. Let's not bring that discussion here. If your goal is to minimize the amount of data required to bring new non-mining nodes online, then that is what UTXO commitments does.
The miner needs to verify the entire block chain history because otherwise he has no way of knowing if he is actually on a valid chain or not. This has nothing to do with UTXO commitments, rolling root, or any other proposal. It's a basic, fundamental requirement of any consensus system: if the miners themselves operate in SPV mode (which you advocate), then anyone -- no matter their hashrate! -- can trick the network into mining an invalid chain. The attacker does so by mining a fork with invalid history and temporarily (by luck or 51%) overcoming the honest network. New miners coming online, or miners tricked into reseting their state then switch to the invalid chain This completely invalidates the SPV assumption and makes it unsafe for anybody to use the network.
"Rolling root" doesn't even make sense in the context of bitcoin, as has been explained multiple times by multiple people in your own thread. Let's not bring that discussion here. If your goal is to minimize the amount of data required to bring new non-mining nodes online, then that is what UTXO commitments does.