Gaming isn't shifting towards cloud computing, the only "cloud" is persistent data so that when your Xbox98 RROD's or your PSwhateverthefuck shits the bed, your iWaifu v.22 FapKing Mod gamesave is right there waiting for you. Physical copies of games get damaged, stolen, or lost, whereas I can log onto Steam from any compatible computer system basically anywhere on the planet I can get internet at and be able to get the entire collection of games that I own to play downloaded onto that system, without having to worry about United beating my ass and throwing my carry-on bag-o-gamez out the emergency exit door.
Drawbacks?
Consoles aren't even honestly qualified to rate as shitty gaming PC's, they're physically and technologically an outdated system by design the day they're unveiled when compared to off-the-shelf components available for putting a basic computer together, and they ruin the overarching gaming experience in general by forcing reduced graphics and oversimplification of game interaction due to literally being a fixed snapshot of hardware and software for developers to do design upon for the next decade. Press X to agree.
Dropping 3k on a system is Luda mode. Flat out. There's no need to spend that on a computer. My entire battlestation including monitors doesn't come close to that number even with incremental upgrades... which is something you're not understanding.
You have any experience with cars or hot rods? Because that's what you're buying into with a PC. Something that comes off the showroom floor doing good things, but as time progresses you can change out the carb for EFI, change the rear diff ratio if you prefer drag to SCCA racing, change the tires and rims, reupholster the seats and throw in a new stereo... All any time you like, if new stuff comes out that does what you do now, or what you want to do, better than what you have.
With PC gaming as new architecture and hardware capabilities come out, the software capabilities increase as well, unlike with consoles. Consoles, as previously mentioned, are a fixed snapshot of hardware development. There are ZERO architectural differences in terms of memory or processing power for graphics or data between a PS4 you bought in 2013 and a PS4 bought today in 2018.
You're literally espousing buying a 2013 Ford Fusion, new-old-stock (because that's literally what it is), in 2018.