There could be other approaches to tranching that reduce impact on liquidity network effects. Instead of making separate tokens for each tranche, we could let people stake stETH into a slashing contract like stkAAVE with a 2-3 week withdraw cooldown period (stETHb), divert an additional 5-10% of stETH yield to this contract (increasing total fees on stETH to 15-20% of yield), and then make stETHb take a certain percent of first losses (eg 30-100%) before slashing impacts the wider userbase of stETH holders. Advantage here is that insurance costs feed back into stETH ownership through staking rather than going to external capital sources. stETH would be the sole accepted collateral for stETH insurance.
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