Ever since uniswap V3 deployed on polygon, many users bridged various tokens to take advantage of the new market and low fees.
This includes pos ENS, a wrapped version of ENS to use on the polygon sidechain.
Users of the polygon network are able to obtain ENS tokens from polygon uniswap. However, in order to actually use them, users would have to bridge them back to the ethereum network, which would incur high gas costs.
Allowing pos ENS to vote on snapshot would be very nice. Other DAOs like AAVE, MANA, and BAL already allow the polygon variant of their token to vote.
The lower barrier to entry would encourage more people to participate in governance, as not everyone is willing to sacrifice a moderate amount of ethereum for gas.