Pick a 1080p GPU from yester-year. Can they play modern games at 1080p? Battlefield 1. Minimum specs GTX 660. Performance 1080p at > 30fps. If you bought a GTX 660 in 2012 to play 1080p games, you'd still be playing 1080p versions of the latest games on it 6 years later.
When Gtx660 was launched 1080p was not the holy grail of graphics anymore. I actually had a 450GTS at that time, a much much weaker card, and I could actually play games at 1080p on it at low/medium settings, including Batman AA with Physics enabled at >30 FPS. Can you do that currently with a GTX1050Ti at 4K? I doubt you can.
Moving on, the Gtx660 could play most games at 1200p with full graphics settings and anti aliasing with ~60 FPS (reaching 90FPS even). And what is most incredible, it did it while armstrung by only 2GB VRAM. There were few 4GB cards in the while and I would have liked to see what it did with double the memory at the few games that broke its neck (but still >30fps).
"The GTX 660 provides a surprisingly high level of performance for its MSRP of $230. It's roughly 23% cheaper than last month's GTX 660 Ti while being only 14% slower when running games at 1920x1200."
Can the GTX2060 play current games at 4K with all bells and whistles and AA turned above 60FPS? No, it can't and neither can the GTX2080Ti most of the time.
The point is, where the Gtx660 performance was in 1080p is not comparable at all to where the GTX2060 is in relation to 4K today, so its totally legit to assume that the GTX2060 will not be as long lived in 4K as the Gtx660 was in 1080p.
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