For action, adventure, racing games, I agree that 3D is almost always better than 2D. Running around in first-person or third-person is way more immersive and gives much more freedom and depth than anything else.

But for strategy games, 2D can still be good. e.g. for card and board games games, even a "3D" game is just 3D graphics over a 2D playing field. Tower defense, factory-building (Factorio). These games have 3D versions but they aren't particularly better than the 2D ones.