Star Wars and Star Trek are creatures of a bygone era where white males ruled the roost in totality, and women and minorities got mostly scraps.
Finn was still eating those scraps out in the shed. The
one opportunity to have a black male character actually mean something to the greater sequel trilogy story, but more importantly, as a representation of the unique perspective/place he should have held in that story, and how it could have been tied into his former life / why he was the right person to destroy it was never even a consideration. Typical of white liberal Hollywood, he was there for "points" while the producers repeatedly put on their most proud PR face, telling the world of how "diverse" and changing the way
Star Wars was presented to new generations...
...except with the lead black male. He was a shameful, tokenized buffoon, underserved, and no one--many black audience members more than most--will
never forget that Finn was a damn
sanitation worker (who happened to be a Stormtrooper) instead of being an
experienced hammer of the FO who--through his eyes--audiences could feel the pain of the oppressed (as he had seen/done too much and was once one of the victims), as he should have been. Well, he was oppressed...by the producers.
There was no reason to make him a damned sanitation worker. It did not serve the story at all, as it would have
if he served in a position that actually provided a major benefit for the mission he was undertaking. And no one truly aware of history will ever buy excuses such as his job was either "comic relief" or the director/writers/producers all being innocently unaware of that cultural anvil dropped on a black character's head. Finn was catapulted back to the era of the worst of Hollywood's stereotypical portrayals of black people--males in particular--right in line with Eddie "Rochester" Anderson, Dudley Dickerson, et al.
He had not an ounce of dignity because--as pointed out before--he was not meant to have dignity, self-awareness, or a growing control/expression of his unique identity and how it should have played a major role in affairs.