No it's not. 2560x1440 has terrible PPI on larger screens. Either way with a 4k monitor you don't technically need to game at 4k as most intensive games offer DLSS anyway.

Yep. I have both 4k and 1440p monitors and I can’t tell the difference in quality so I always use the latter for better frames. I use the 4k for reading text though, it’s noticeably better.

There are good 4K gaming monitors, but they start at over $1200 and if you don't also have a 4090 tier rig, you won’t be able to get full FPS out of AAA games at 4k.

Almost no one plays on native 4k anyway. DLSS Quality (no framegen etc) renders at 1440p internally and by all accounts there is no drawback at all, especially above 60fps. Looks great, no noticeable (excluding super sweaty esports titles) lag and 30% more performance. Combined with VRR displays, I would say 4k is perfectly ok for gaming.

Taking anything Linus or LTT says seriously is even dumber....

I watched the same video you talking about [1], where he's trying the PG27UCDM (new 27" 4K 240Hz OLED "gaming monitor" [2]) and his first impressions are "it's so clean and sharp", then he starts Doom Eternal and after a few seconds he says "It's insane [...] It looks perfect".

[1] https://www.youtube.com/watch?v=iQ404RCyqhk

[2] https://rog.asus.com/monitors/27-to-31-5-inches/rog-swift-ol...

Nonsense 4k gaming was inevitable as soon as 4k TVs got mainstream.