No, not every new triple-A game. They're also often late and/or broken, if indeed they arrive at all. Valkyria Chronicles, Enslaved, Vanquish and Bayonetta took years. GTA5 took years. Final Fantasy IX and X took decades. Final Fantasy XV has no PC version in sight, nor do RDR/RDR2. Just to name a few off the top of my head. They're almost all ports too. The original developer works on the main PS4/Xbox version(s) and the secondary PC/mobile/handheld/tablet versions are done by different studios. I'd rather play the original than a port.
As for exclusives, there's very little to miss there. PC exclusives all suck these days; they're mostly just glorified mobile/Flash games. Or glorified board/card games that don't need to be video games at all. Might as well count all the games on Newgrounds as "PC exclusives" because that's the sort of quality you're seeing in many cases. In fact, many lauded PC exclusives (Hearthstone, FTL, Papers Please, again just to name a couple) can be purchased and played, feature complete, on phones or tablets. What does it say about a gaming platform when its exclusives can be so easily adapted to these platforms and lose nothing in the process? Nothing good, anyway.
This wasn't always the case; '90s PC was the bomb. PC is where I started gaming back in 1989 at the age of 3. I spent just as much time, if not more, playing on PC throughout the '90s as I did on console. Unreal Tournament is in my top 10 games of all time, and I still have an old Pentium 4 PC running Windows 98 so I can play these classics whenever I want. Its specs roughly match a top-end PC from about 2000, which is around the time the PC's golden age ended, so I can ideally play everything up until the end. There was a brief resurgence in 2004 with HL2 and WoW, which I did buy a PC to play, but beyond that there's really no exclusives that I feel I've missed out on.
PC doesn't have full backwards compatibility either. Try playing Win9X games on modern Windows without virtualizing. Or DOS games without DosBox. Hell I even have trouble sometimes getting DOS games to run on that Win98 PC I mentioned, and that's with real mode DOS! Even back then backward compatibility wasn't assured.
Virtualization and DosBox are emulation, and emulation is not backward compatibility. I can run emulators for older consoles on my modified N64, Dreamcast, PSP, Vita, Wii, WiiU, DS, 3DS, possibly even more. I don't consider them a true replacement for any of the systems they can emulate though, and the same goes for PC. I wouldn't want to emulate full-time. If you're going to start seriously playing through these old games, you need original hardware to do it properly. I have all the original console hardware, modified as needed for RGB output and region-freedom. They're all hooked up to a PVM and ready at a moments notice. Emulation is fine for quickly dabbling with playing old games, but it's far from perfect. Same reason I don't simply run a Windows 98 VM for those old Windows games, or Boxer for playing DOS games; I actually have an old PC of the era dedicated to this. There's no true substitute for original hardware.
Sorry this was so long, you may not even read it...