Games get more demanding, so you can't really say that a certain level of performance is enough for 4K. Like the 3080 was amazing at 4K when it came out, but now it's not going to run any new game without heavy upscaling.
Also, new lower-end cards usually offer good 1080p and 1440p performance, but really struggle at 4K because of VRAM (bandwidth and capacity) and low ROP-counts. The 5060 is almost as fast as the 3070 at 1080p, but at 4K the 3070 is 27% faster (same bandwidth, but double the ROPs).
I'd go as far as to say that only top end cards are suitable for native 4K rendering in newest games, and to be honest, currently I'd only count the 5090, 4090 and barely the 5080 (and nothing from AMD).
If you look at your reviews, games like Wukong, Alan Wake 2, SW Outlaws or Stalker 2, you pretty much can't get 60 FPS at 4K on anything but those three cards. And those games are very representative of most big games that came out this year (Monster Hunter, AC Shadows, Oblivion, Clair Obscur and even Doom).