As the name suggests, Im wondering if people such as myself who used to play a lot of 3S found it harder to play after playing a lot of SFIV. Include an explanation of sorts.
playing 3S makes you a bad human being.
No its just difficult to jump between different games for most people. You should be able to adjust after a few hours or a day at max. The more fighting games you play and the more you jump back and forth between them the easier it is to transition.
Playing more fighting games makes you better at fighting games. I know i got better at ST from playing SF4. There are a lot of fundamental aspects of fighting games that carry over, like footsies, conditioning, reading, fireball wars, execution etc.