I switched to Mac around Vista and never looked back. For games, enlightenment is realizing the PC gaming tribalism is dumb and PlayStations are actually really nice. It's an appliance that plays games without giving you trouble, in a comfortable place instead of encouraging you to spend even more time at a desk.
This is key. I work all day on my computer. Why would I want to go home and sit in front of another computer for hours.
If your interests lie entirely or mostly in the realm of AAA or AA games that are playable with a controller, then I completely agree.
However if your interests lie in indie games or games that require a keyboard and mouse interface (precision shooters, grand strategy games, RTS games, etc) then having a PC that can play games is completely necessary. (I say this as someone who runs linux btw, not a windows defender).