I don't think there's anything inherently wrong with season passes or paid DLC. The former cuts out the overall price of some DLC I was already gonna pick up, and the latter can be used to help support a developer.
The problem is Tekken's aversion to paid DLC for characters (and I think stages?) has been flipped, in addition to a delay of a game people have been waiting on for years.
And then, after months of teasing, these dudes are like "yo, sorry for the delay, buy the season pass". Like, it doesn't feel like there's anything in return for the fans. A more polished game is great, don't get me wrong. But I'd be lying if I didn't feel like a positive thing would have soften the blow. A demo, maybe? I dunno. Just something.