It's a good feature from an individual perspective. It's not a good feature if you don't like cultural bubbles forming. Democrats will block Republican ads, Republicans will block Democrat ads - will that lead to a better world when Republicans can't reach Democrat voters or vice versa? I find this focus (attack?) on political advertising on social media platforms by traditional media companies to be self-serving and…
It seems like targeting people committed to the other side wouldn't be a good use of campaign funds? With low voter participation rates, there is a lot more to be gained from increasing turnout for your own side.