Think about it this way, you have to have Win 10 to play any of these games.  MS want Win 10 to be the defacto desktop PC OS - MS Wins

You have to purchase the games through the Win 10 Store.  MS wants the Win 10 store to be the defacto store front on PC - MS wins

You have to use XBL servivces to use their groups, hubs and other services.  MS wants XBL to be the defacto game service or just service period on PC - MS wins.

MS want Azure to be the defacto could service for games on PC - MS wins 

MS want MS game studio to be a juggernaught on PC - MS wins 

MS want to spurr more PC sales including hardware, this keeps the PC seen healty, makes their partner happy and those partners uses Win 10 as defacto OS when they sale the system - MS Wins

I have even more examples but will not make this post to long.  The problem with gamers is that you are so focus on console war this that you forget that MS as a company has many different products that has nothing to do with consoles but can use the console to leverage those other businesses and thus create huge reveiw streams for them.  In MS mind, its not the amount of hardware you sell but the amount of consumers you get as repeat buyers in your ecosystem that generate a constant revenue stream.  MS will continue to make a console but they are not limiting theselves to just the console gen but instead want to make the PC ecosystem their system which has a much bigger install base and revenue stream.

This is the message I got from E3. There is no exclusive on xbox. I got a PC so I got every xbox games. Only Sony and Nintendo got exclusives now.

What's the point to have an xbox when you already have a PC ?

So you're asking if all ps4 games were on TWO devices would people claim there is no ps4 exclusives? Yes.

At least in this context. In the context of "only on one system" they would no longer be exclusive to one system.

I believe completely that Microsoft is using all of their titles on PC as a secondary revenue stream since they are not beating Sony. If they were they probably would've seen profit faster on their versions of multiplatform games as well as exclusives. Even if they wanted to keep games away from PC they couldnt. If they were winning they wouldn't have to worry about not turning profit. It's not completely that they want to bring everyone together. It's smart but very tactically revealing.

There's one major issue about all that. Windows 10 Store. It's literally the key to if any xbox games sell on pc or not. The problem is that it already has a bad reputation amoung pc gamers. Crappy/buggy ports and no mod support. Until the store is as good as steam and repairs some of it's reputation with pc gamers, the software sales through it will be miniscule compared to steam or consoles.

Hopefully, it works out at least somewhat well for MS or that they learn from it quickly then adapt. The gaming market as a whole is better off if MS stays in it. It can't keep making costly mistakes though if it wants to stay in the gaming market. 

PS Now is a weird example. I mean you can play them on samsung without even a console. So in that regard it is irregular.

I also have no clue about values in exclusive. I simply answered your question. If all ps4 games were on more than one system - they wouldn't be exclusive to the playstation 4.

They could be brand exclusive, console exclusive, "not on Microsoft" exclusive etc - but they wouldn't be "exclusive.

So you're asking if all ps4 games were on TWO devices would people claim there is no ps4 exclusives? Yes.

At least in this context. In the context of "only on one system" they would no longer be exclusive to one system.