Those who argue that forcing Apple to open up their ecosystem is a good thing appear to believe that increased user freedom will lead to more option for all and increase freedom further. Those of us who argue that being forced to open their ecosystem is a bad thing believe (speaking personally) that any user freedom added would quickly be lost and set further back than we started as larger organizations would end up strong-arming or tricking users into giving away their freedom or fear missing out.
Personally I think we all want to see long-term user freedom, and I think whether we expect it to move forward or backward is what differs between us seeing this as good or bad.