It could have been a better experience if both IPL and PSL allowed each other countries players but to be realistic, both countries do not need other country's players or support to make them successful. IPL is a successful league without any Pakistani players and similarly, PSL is a great league without the Indian players.
Pakistan and India both have produced great players both in the past and right now like Shaheen, kohli, Rizwan, Rohit and more. IPL is doing fine without Pakistan players but it will be more entertaining to see Pakistani players playing IPL. BCCI dominance in cricket can be seen from the fact that they never allowed there players to play any league. As long as politicians of both countries don't have a consent, we will continue to miss action cricket of both countries against each other.
BCCI and Indian government never allowed Pakistani players to be participated in IPL because they all know about this and sentiment in India against Pakistan is very high right now under Modi regime even now if these lost election then still there is no way for this due to hate which recently too much spread by religious peoples across the subcontinent and other thing is in India they believe if Pakistan is going to have any profit or good result just because of India never do this, so we all watch what happen in first edition of IPL when many Pakistani players were on high and steal this show from this day they feel its never been good, so they ban Pakistani Players from participating into this event, and now it's never going to happen positive in next few decades.