I understand being disappointed, but I don't understand choosing to toss it all aside because of that. Unless they've completely changed the entire character, wouldn't it be best to try and build off what's still there that you're familiar with? And try and find new ways to utilize that character now?
I use characters that I like, even if I suck at playing them, so this "I only want to use 'good' characters" mentality seems like a pretty joyless way to play. But I know I don't look for the same types of things in fighting games that others do, so I'm sure that's why I don't fall in line with this way of playing. Seems more like a job than something to enjoy.
I'm sure people have a multitude of reasons, but I'd hope they'd have a bit more resilience. But again, I'm not a part of the FGC so who am I to say.