That they were able to add it this quickly just shows that those features and bugs were already being worked on and Larian just knowingly released a unfinished product.
Or it shows that they're very responsive and diligent in their work.
Even if what you say is true, they still work way faster than other studios who similarly release unfinished products and take their sweet time patching things up.
And again, that Karlach scene is very difficult to do on short notice. That's not something they could've planned for, because it was in direct response to the demands of the fans. So that's a mark against this idea that all these patches were in the works prior to launch. Perhaps part of what's in them may have, but you couldn't possibly account for all of it without the necessary feedback.
