So if you haven't noticed in this game most of the tanks are casuals and the weird, stupid classes no one likes like Bards that typically Hardcore Players play are DPS.

What this game did was make all the popular classes Tanks so there won't be as much of a Tank shortage. When Heavenward came out years ago people were pissed because Dark Knights were put into a tank class, even though Dark Knights are known for being mainly a Damage Job.

That's why you always for the most part see the local Mechanics Nazi/whiner as a Bard or other DPS class. If they did talent trees there would be a shortage of healers and tanks. Believe me, there are a lot of Healers who just don't like healing as it is in this game and prefer DPSing.

Also, you would have a lot of tanks who would switch to a DPS Tree. Also the Hardcore Minority is not large enough to make up for the tank shortage so even if you made a Bard have a Tank Tree you would see longer wait times.