If you're Microsoft, you have to do something. Every game available both on XB1 and PS4 looks better and is smoother on PS4. To great media and internet nerd attention. They are losing the cross platform title war, and well the war with Sony at the moment, and its getting sensationalized every time Digital Foundry or whatever does a platform comparison. The PS4 version is always superior. No doubt some eager X1 fan will find an exception to jam in here, and that's fine, but Microsoft knows the score.
So this has to suck for MS. Literally the only way to prevent this from happening is to buy off the publisher. Give them piles and piles if cash to NOT release on PS4. So there can be no better version than the Xbox version!! I was marginally interested in the new Tomb Raider, and likely would have picked up on PC instead of PS4.
But moves like this have always had the opposite effect on me. There was little chance I'd ever buy an XB1 before Microsoft paid off Square Enix, and this kind of stinky shit doesn't do anything to change my position. But I get why Microsoft did it. They are in a position of market weakness, they need a win, and the best way to assure a win is to win by default. I just don't think TR matters quite that much. But it's a start I guess.