Re: liquidity fragmentation, it’s just a router issue, it affects LPs too, as with lower liquidity arbitrage trades become less profitable, and sandwich attacks more profitable.
Arbitrage trades is one of the main fee sources for Uniswap LPs. N pools of k liquidity are going to generate less fees for LPs than 1 pool of N·k liquidity, unless the transaction fees are zero. Most L2 have small tx fees but they may be significant enough to change arb trading patterns, when liquidity is shallow.
As said in my first post, don’t have strong objections to the proposal, just wanted to point out this technicality.