Let's face it.  We have three major competitors, and they all want our money.  And what makes one stand out from the rest... EXCLUSIVES!  If a title is released on both the Xbox One and the PC, then it's exclusive to Microsoft.  So Microsoft reaps the benefit whether the title is bought on the One or a Window based PC.  The same with Sony with Persona 5 being released on the PS4 and the PS3.  And we've had titles to be released on both the PS4 and the PC.  If one can make the argument that "Why do I need an Xbox One when I can play it on the PC?", why can't the same be argued against the PS4 when that game is also on the PC?  The exclusivity, I think, refers more to the competing company rather than the hardware itself.

Because not everyone has a gaming PC. The logic of Xbox haters is that apparently every single PC will play games at the same quality of an Xbox One is absolute crap. My pc has Windows 10 and it can't even play  Alan Wake which is a is like an 8 year old game. Also, if PC was the go to gaming system for everyone, every PC game would obliviorate PS4 and Xbox game sales, yet they never do.

It's not really about Nintendo, so we can leave them out.

The important statement is that the PS brand doesn't have as many exclusives as it used to have. I don't think this can be disputed when one thinks back to the PS1 and PS2 eras.

I've visited VGC for over a decade now and ten years ago things were different for the PS fanbase. The Xbox camp argued that console exclusives should count the same as exclusives, but this always led to conflict with the PS and Nintendo fanbase because a console exclusive really isn't on the same level as an exclusive. At one point it got so bad that the mod team (I believe it was in early 2008) officially declared (and stickied the thread) that console exclusives are prohibited from being listed as exclusives; there were lots of list wars back then, much more than nowadays.

As the generation went on, it became more and more common that games became multiplatform and by the time the PS4 launched, the PS fanbase was ready to embrace the term console exclusive because actual exclusives were scarce. Lists needed to be padded which is the same motivation that the Xbox fanbase had several years before. Once a controversial subject moves from being argued in favor of by a minority to being argued in favor of by the majority of the community, it becomes a common and acceptable practice. Of course, a lot of the conflict between console exclusive and exclusive remains, because PS and Xbox combine only for a slight majority while the Nintendo and PC camps are a big minority.