My *opinion* about goblins and those that play them is that they're unhealthy for a game. The player wants the NPCs to focus around them, either with them being an oddity or something to always be looking for. It's snowflake-ish, and I greatly despise when a player tries to pull something like that. It can ruin enjoyment for other players.
I would tentatively agree that ANY one "thing" can be misused and abused by snowflake (or for that matter powergamer) players.
I don't think that is useful as a basis for "should this be in a game system" although if you have snowflakes on board, it's certainly logical to use it for "is this going to exist in MY campaign".
I wouldn't have considered goblins one way or the other (I'm open to most ideas) but Sazza is just too awesome.
For me, she is the Drizzt of Goblins
But the whole game is already "snowflaky", we are an oddity surrounded by even more odd people already. In a game with a possessed black human, a lost githyanki warrior, a pale elf vampire, a depressive priest and whatever Gale hides. Man they all have incredible issues. They are all pansexual as well, they just do not care who they bonk. And noone around it judges one bit or makes a remark about the funny company you keep. At the worst you get a comment like: "Oh yeah Drow, I fought a lot against Drow, formidable opponents." I have not seen anyone comment on any of my companions. A Gobbo with a serious condition would fit right in, regardless of it being NPC or PC. Sazza does seem quite a character compared to others to not have her as a companion is rather foolish in my book. She also has the snarky attitude that all the other companions also have, so yeah it just makes sense.
As conclusion, the fact that we have all these companions and PC options, makes having a goblin choice more logical and reasonable than not having one. The whole EA can be seen as a precedence.
