Umm...we all know that their stance is based on a business decision. I'm not sure what makes you think otherwise or that we don't know Sony's position on cross-play?
Is it a good business decision to be anti-consumer and anti-developer though?
As he said in the article. Its not a flick of a switch. There are pros and cons to them as a business entity. What they are doing is testing the waters and opening up by just a little to see the effects. He is saying "fortnite seems to be doing well" which sounds like they are trying to learn and see how this featyre works.
People who quick to say anti consumerism is annoying really. Sony is running a business and they need to see how this, frankly, huge decision will affect them. I know I am not looking at this as a consumer and more into how a business works.
If a factor outside your business plan suddenly takes more attention, you try to test and learn what will happen if you consider it.
A child can stomp their feet and cry out but that does not mean that the parents must give in immediately to the demands of the child. Some things just take time.
The only mistakes they are making from what I see here is their messaging they have and they need to react much faster. I may sound like I am defending sony but I just don't enjoy seeing little kids throwing a tantrum and sounding like a spoiled brat.