The higher-level conspiracy theory answer is that CCS was developed by a committee of people from organizations who did not want EVs (ICE manufacturers) and hated Tesla (although they didn't take Tesla very seriously).
In addition to the clunky design, the committee delayed ratification of the standard until after Tesla started delivering the Model S to customers. I believe (not confirmed) that the original CCS was also limited to 50 kW charging speed and it wasn't until Tesla started clobbering Porsche in the market that the standard was changed to allow 300 KW so Porsche could claim superiority.