Yes this was a good interview. I really liked that he specifically said they are designing the UI to be able to easily support someone creating a mod to increase party size to six. I sure hope such a mod will be among the first created, and that will be an automatic add-on to any BG3 game I play. Because party of four is just simply not D&D to me.
I agree its sad that we have to wait for a mod and not say an option we could trigger in the options menu since larian themselves see it as a wanted feature