Thanks for this topic!
Though high level I agree with the concept of vesting or generally speaking creating some friction between reward and selling pressure, I fear locking rewards may translate in a premium that investors would require. Silly example with unreal numbers just to clarify the idea, folks may expect a 20% APR for staking without locking, or 35% with locking.
When staking itself is “ve”, there should also be a premium for it as users sacrifice being able to react to the market. This may be done in the form of having staking rewards allocated with different weights depending on the time to expire of the time lock.
Not necessarily if staking model entitles LP tokens, as done with BAL/ETH BPTs. Like if staking HOP meant staking the LP token of HOP and ETH. Not saying we should go this direction, just saying there are ways around hurting liquidity.