>>281572621
Because it's the equivalent of going around dressed like this.
You see, back in the day, this was fashion, this was cutting edge, this was modern and new. But nowadays this kind of clothes sell only to a very small niche of fans of old timey things.
Ashita no Joe back when it aired was avantgarde, a novelty, a very popular; nowadays, if someone made an entire series trying to imitate AnJ style it would not sell very well, because the audience would think it's something demodรฉ, out-of-time, trying to be something from another time.
Basically what you like means nothing compared to what everyone likes for those who have to actually make a living producing anime.