tank chocobos are not useless, they actually scaled really well with the expansion.

i was killing Tier 3 Mark Bills in the Hinterlands and Azys Lla on BRD at Lv 51. it actually got harder since i got to 53, have to slow down DPS so the Chocobo can hold hate.

point 1 is a technical problem that they haven't been able to deal with since forever.