I agree with you it makes no sense to turn it now on in V2, but I hope you will propose a vote after the v3 launch!
I think you miss out some points with why reward UNI holders, if you think about it the big value behind it is the network-effect. If UNI holders get rewards, more people trust in the protocol more people want to hold UNI → UNI is in the news. So more people talk about Uniswap, more people use Uniswap → LP get more rewards → UNI holders get more rewards → more people use Uniswap, talk about it and spread it.
The clear benefit is the network-effect and the catalysts for it would be turning on the fee switch in v3 so UNI holders have real value and therefore use the network-effect to get the volume of the DEX to surpass all major centralized exchanges.