theres some reason to care - non-federal entities still make and enforce anti-bds laws, and put support for israel into contracts for working with them.
if you want to be able to have say, cheaper government, you need to be elect local officials on the palestine side, so that folks other than just the pro-israel ones can bid
That’s assuming that the antisemites are cheaper.
But a company boycotting others for political/religious agendas is not going to be able to provide the cheapest/best service, it’s therefore not optimal to go with companies that practice BDS.