Borderlands 3 crossplay

crossplay should be on ps4 as well why is it not

Cause 2K and Sony couldn’t agree on the deal that would suit both parties.

Is there any chance of cross play coming to the ps4 at a later date?

That probably depends on a change in senior management at one or both companies. There’s a whole thread about this somewhere, but the short version is Sony wanted monetary compensation whenever more people were playing crossplay on non-Sony systems than Sony systems, and 2K said “Nope”.