I actually agree with Phil: Sony's Reasoning For Blocking Cross-Play Is "Unhealthy,"

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Libara said:

Pinkie_pie said:
if xbox one is ahead of the ps4 worldwide, they would block cross play just like they did last gen

Can speculate all you like, the only current fact is that MS and NN are allowing it and not sony. 

Its not speculation, that actually happened last gen.

 

I agreed with Sony last gen when they were lagging behind and wanted to support cross play between the ecosystems and I agree with MS this gen while they are lagging behind and want to support cross play between the ecosystems.  More people to play with is better for everyone.