Answer is simple but people wanna give the run around, they just don't have the library to make a similar list, OP.
None of those games listed existed before PS4. But look at most of the replies, 90% of the list is literally the same list from OG Xbox lol. Halo came out in 2001, Forza 2005, Gears 2006. You've been buying the same games for 2 decades and then turn around and complain about a lack of originality in the industry. "And there's backwards compatibility so you should have access to 200 games" is an embarrassing answer only somebody on MS payroll should be giving out.
Nobody on the fence is spending $300-500 for 20 year old thawed out, re-frozen, thawed out again shyt and Ori and The Blind Forest. Babies born in 2001 are driving, voting, fukking, and making babies of their own. If you ain't finished the fight in 20 years it just ain't gonna happen, the fukking Iraq war ended before this shyt lmao.
I've spent most my life playing games, but these days there's other things I need to sink my time and energy into so I'm beyond casual at this point. Even with that I can still name shyt like Bloodborne, it's almost like they didn't release another console after the 360 and that's a Microsoft problem OP, not ours.