PAL is 50 Hz because British electricity is 50 Hz (and when it was designed it wasn't so easy to tidy up electrical interference and stuff) and also because it's higher resolution than NTSC/PAL60, but still has the same bandwidth. It's also still faster than the 24 FPS a lot of films are still made at - low framerate content is pretty tolerable when each frame is exposed for the same amount of time it is to be displayed for as your brain can compensate pretty well, and when PAL was designed, there wasn't anything like games which used instantaneous frames.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56