Did the launch of Uniswap V3 provide the solution as stated? They launched V3 to address the problem of high transaction fees. If this case is not answered, then the launch of V3 still fails and does not provide the best solution for users of the Uniswap platform.
It was a soft launch which means that the transactions between L1 and L2 have a very long finalization time. 7 days in this case. Then once on L2, you can create your money legos with minimal transaction cost and move around positions. Version3 has only allowed a limited number of currencies and there isn't much you can do yet.
You'll need to wait to see how this grows. I doubt that with the incentives of transaction front-running removed, the DeFi trading won't remain so lucrative. We are already seeing a bear market incoming due to these changes.