I have no dog in the fight honestly because Pup is one of the few jobs I'm not really interested in playing but, I hate this justification, they use it all the time and it is completely nonsensical,

"The concept of the _____ is that they _____ so we will not be adjusting _____ to make them _____."

The devs (and/or translation team) really need to get it through their heads that just because something was intended a certain way, doesn't have to overshadow any changes that would make the end design more successful or enjoyable to the playerbase. Ninja wasn't designed as a tank (as I'm sure has been mentioned) but embracing that made them usable and enjoyable for the population, and there are a ton of examples of such. Rdm was designed with meleeing in mind, but that's been the exception not the rule, for many many years.

A potential change "not matching the designers' original intent" is not a reason to deny something, please, give us real reasoning (if there is any), so we can have an actual debate on such topics, for example:

"We believe this change would be too powerful because of _____."
"The technical aspects of this change would be too difficult."
"With the amount of work that would be put into _____, we believe we could improve other areas more."
"We are afraid this might negatively impact another job or situation because of _____."

Jobs change over time, their identities even change, Ninja was not designed as a Tank, Beastmaster was designed as a soloist, Redmage was designed to melee, heck the entire game was designed around the concept of the "exp party", which isn't the core of XI anymore, it's now the endgame, and it has been for quite some time, saying you're not going to make a change because that wasn't the original intent seems silly, considering how many changes that have been made in the past that completely changed how things worked.