One is designed by committee, the other is designed by a company with a focus on trying to make electric cars more usable and desirable than fossil cars.
Also, CCS wanted to reuse some of the pins from the L1/L2 J1772 plug, but the original plug didn’t have room for larger pins. Tesla’s plug was designed from the beginning to be eventually capable of fast charging.
One is designed by committee, the other is designed by a company with a focus on trying to make electric cars more usable and desirable than fossil cars.
Also, CCS wanted to reuse some of the pins from the L1/L2 J1772 plug, but the original plug didn’t have room for larger pins. Tesla’s plug was designed from the beginning to be eventually capable of fast charging.