1. If you want to complain about Chakrams as thrown weapons you're about... 20 years too late. Chakrams have been throwing weapons since the original FFIII. Whereas an 82 foot long whip is not exactly something FF is known for.

2. Within the context of FFXIV Dancers are still Support oriented. In general offline FF's don't have roles ((with the exception of Explorers) your average job is DPS with some form of utility outside of White Mage/Paladin really) like this game.

3. Dancers also aren't exclusively support. They started with the best trait they had being Sword Dance after all. If you wanted to make a point about the issues with Dancer it would be that it's never been a ranged DPS class, not that it's exclusively Support.

4. Dancer is ultimately irrelevant to your desire for a nearly 90 foot whip, which is pretty absurd sounding.

5. Blue Mage being able to work out in terms of roles is irrelevant to the issues with adding Blue Mage as a normal job.

6. Red Mages claim to fame, at least to me, is not being a Jack of All Trades. XI broke that already, as did Explorers, and the simple fact is they're poorly balanced so in order to be balanced they really can't be JoAT. It's that they use swords, white, and black. Red Mages still maintain that, so them being a specific role isn't really an issue. Blue Mage does not have that luxury.

7. Dark Knights have tank like qualities in offline FFs, so that's not really an argument. I also didn't say Blue Mages couldn't be tanks (I would say they don't really have those qualities in offline FFs, but that's a different subject matter). Though really Dark Knights aren't a great implementation.

8. Summons are kind of all over the place, and Summoners are poorly executed in this game, so not exactly seeing the argument here. They aren't exclusively one turn effects though.

9. Using poor executions of jobs as justification to continue to poorly translate jobs is not exactly something worth supporting. If you're argument can be easily summed up as a logical fallacy (tu quoque) then it isn't a good one.

10. I mean, as what you're proposing still doesn't entail removing the Limited Job aspect then nothing really changes in that regard. So it's kind of a moot point. I suppose you can use it as an excuse to not expand the concept, but honestly not even sure what citations you have to back up your claim it's "universally abhorred". Honestly doubt you have any. Note that anecdotal evidence or a lack of Malboro mounts are not evidence.