ON PC. That competitive scene doesn't go much to consoles, and even if the consoles offered that option, they would not abandon PC where they have even better options and can actually have high res and high framerate.
the logic is the same. as yourself why 1080p monitors with 240Hz refresh rates were still being released after 4k and 1440 were already a thing.
regardless of the power of the PC, you get more frames, at lower resolutions, and lower resolutions are often chosen on PC, why in the same games, would a console player not also choose higher frame rates at lower res? the game is cross platform now, so you play PC players anyways, may as well do what they have proven leads to better results.
I won't argue against PC having better options, but even so, when optimizing a PC game for frame rate, lowering the res is usually the best thing to do to increase the frame rate. And also on PC 1080p is often chosen to push as many frames as possible EVEN THOUGH a powerful PC may be strong enough to run high frames at a high res.
lastly most PC players don't have those ultra-powerful PC's so you shouldn't generalize PC gamers based on the most expensive setups that exists.
^Yes that's me ripping it up in the GIF. :)