Its mostly about the imbalance between MoE maximalists and never-send-bitcoin HODLers and how incentives are sort of inside out: if you're a MoE maxi and do a lot of speed-and-replace, that means you have to keep a lot of dollars on hand to replenish while you're shopping at bitcoin-accepting merchants. and if the merchants hoard their btc and don't ever spend (and replace) it themselves, the MoE maxi is basically a liquidity provider with a close tie to the fiat system.

basically, circular economies can never be perfectly balanced and getting to a game theoretic equilibrium probably means a lot of thankless altruism and evangelizing on the part of the maxis