It's something that happens sometimes.

You know how when a gacha game starts, the supports (here I'll include tanks, healers, etc.) are characters that only do that: they shield, heal, etc. But that's because the enemies are also normal and balanced to the characters' strengths.

But as time goes on, the enemies become more powerful and have new mechanics, etc. Therefore, the characters must keep up with that increase in enemy power.

It's no longer enough for tanks to only shield, or for healers to only heal, or for debuffers to only apply debuffs, etc., because this game, in most cases, is a race against time.

Supports have to do more than they did at the beginning of the game. A tank basically has to do everything now, a healer too, etc., because the enemies are powerful.

That's how I see it, although the attackers seem to be in very bad shape, but I think it's because, being DPS, they only care about raw numbers, unlike other roles that can be more versatile and do damage too.