Larian shipped an incomplete game at launch and has done nothing with its patches but partially finish the game. I don't think I speak only for myself, but I tolerated this because I expected a truly finished game some time after release. This has been Larian's business model, particularly for the Divinity series. Their claim that they don't intend to work further and will leave Act 3 an incoherent, incomplete, unpolished mess is a disappointment and has put me off buying Larian games in the future.
In any case, here are some more Act 3 complaints: 1) Saverok's random appearance partway through a story quest is bizarre and jarring. 2) My character has a background from Baldur's Gate and has made no comment about needing to get their family or friends out of the city. 3)There are smuggling boats everywhere, but absolutely no ability to smuggle anything or hire a smuggler. Not even for the refugees.
How would a background in Baldur Gate city be implemented for a custom character ? Given you have several background choices at character creation : nobleman, urchin, sage, acolyte, bandit....... Do they need to create a backstory for you for every possibility (+ race variation, gender variation) The absence of material memories in your home town is a normal price to pay for a completely free custom character design IMO. If Larian added things, players would be annoyed because it doesn' t fit entirely what they had in mind.
Those are all good questions that Larian themselves opened the game up to. They didn't have to give your character any connection to the city but by default they have you be from Baldur's Gate unless you're a gith or a race that originates in the Underdark. I know at least one moment where NPCs recognize you as being from the city because you "have that vibe" or something along those lines. They didn't have to do this, they could have just let that detail out and kept Tav as an entirely blank slate. But they didn't, so they have to justify that choice. What we have now is a half-baked origin that gets in the way of people's headcanons for no good reason. If they didn't want to get into giving us origins, they shouldn't have taken the first step.
