You say that like the community ever agreed on what they were asking for. Some wanted a caster with Blue Mage flavored spells learned the traditional way, some wanted the traditional Blue Mage design where you learned abilities and could switch them out.
And while you're right that different in and of itself doesn't make it good, you and others seem to have already made your decision that because it is different that it is, in and of itself, bad...solely because it doesn't match what you were expecting. You haven't even played it, nor tried the content being designed for it, and have already proclaimed your judgment and thrown it in the trash.
Also, bait and switch? That would require them not having been upfront that it was different from the moment they announced it. If they had acted like it was going to be a traditional class and then explained as this version, that would be bait and switch. Within seconds of the trailer ending, they were explaining that it was the first "limited job" and would have an initial lower level cap, which immediately set the expectation that it would work differently. There was no time for them to bait you on this, much less then switch.
So while I'm not surprised that some of ya'll are getting uppity and going for the backlash route on this, I have no problem calling you out for your backlash being unreasonable and honestly childish.