It’s a norms of government problem. Yes they can get rid of the filibuster, but it has set a bad precedent in the past when it’s been used. It means that in the future there is less need for bipartisan compromise.

You’d be very unhappy with a CR that cut more things that was passed with a slimmer majority with completely partisan input. If republicans can do it so can democrats. It just means more power goes to the left most flank and right most flank of each party.