I think we need to weigh the possibility of the further growth of deposits at scale along with fluctuating gas prices. With the current architecture, it is inevitable that we will get to a point where updating the trees will be a costly process that no individual will be willing to bear.
Another problem is that people are only focused on updating withdrawal trees due to miner bias in claiming their rewards and not the deposit trees. Many in fact will only update the trees up to their associated events so they can redeem, requiring incremental updates from multiple actors that inhibit the rate at which TORN is issued to AP miners.
I think we should lock in an on-chain incentive in place, to keep all trees in sync. Therefore, fewer individuals in the community hear about queries related to claiming AP, and the rate of TORN issued is normalised (not like the current situation where it becomes clogged).