I disagree with that big time, especially with the part that you said "3ds Max is meant for games so it should work with a gaming card". Yes, it will, but not as well as it will function with a Quadro card, you cannot expect a gaming card, a card that was specifically tuned for gaming (game engines are mostly pre-calculated), to do realtime raytracing calculations. 3ds Max may be "made for game design", but it is still a workstation-grade application that performs best on workstation-grade hardware. It is possible to run the program on a gaming card, but it will be harder for it to perform as well as a Quadro can, especially with no problems.
I've had first-hand experience with trying gaming cards with 3ds Max vs Quadro cards, and my experience was not positive at all.
Back when the GTX 980 TI came out, I (stupidly) bought a GTX 980 TI AMP EXTREME! version from Zotac. It was too big for my case, and required a super powerful power supply. Fortunately, my workstation came with a 1,300 watt power supply so it was not an issue for me. What was an issue was the major performance hit I took in 3ds Max and Modo. 3ds Max performed poorly with the new card and it's latest drivers. Modo simply failed to draw the viewports with the Zotac video card. It was great at games, but that's about it.
However, when I replaced the video card with my weak Quadro K620, 3ds Max worked just fine, and Modo was able to draw it's viewports rendering it functional again.
This video can explain a little better with Maya. (The video is dated but shows why Quadros exist.)
Different experiences for different people, but I personally do believe that there are good reasons why the Quadro cards exist.
But hey, to each their own mate. 🙂