There is no reason why an Ork can't be a gambler, or a smooth talker...
Granted, mechanically they are not an optimal choice (no bonus to charisma), but doesn't mean they (orks) can't be anything they choose to be...
Seriously, people get hung up on the "numbers" side of things too much. There is no reason why a trog or tusker can't be anything! Be that a award winning scientist, or a legal expert, or a construction engineer (Especially the a construction engineer! Not much brain power required there from my experience!) or any other profession.
Sadly however, there are some practical limitations. If an Ork's lifespan is only 45 years, spending 25 years gaining the educational knowledge to be a doctor leaves the poor Ork working his "golden years" when physically all he wants is a blanket and a rocking chair...
Which ties back into the "life fast die young and leave a good looking corpse" mentality of many trogs and tuskers... And society in general.
Orks' maturation rate is very much out of sync with a modern world and the knowledge one needs to be successful in a modern era. Orks and trolls both mature physically much quicker then rest of humanity, but they still learn at the same rate as everyone else. So if it takes 16 years of schooling to be a Doctor... (12 years of primary and high school, 4 years of medical school) That is HALF their lives spent learning just to do something!
They will never reach the age to collect a pension or old age security, and eventually they will become too "old" to actually perform their jobs, requiring them to be forced out, or quit...
And none of this speaks to the overt racism that actually exists in SR... Such as the Aztlan "breeding" program that began after the Yucatan Wars, and which we saw the effects of in WAR! (you'll have to read close to see what I mean, see if you can find it!).
No, SR is "against" the trog and tuskers... but that's what makes them fun too