You very much 'can do a whole brisket perfect'. But you are quite correct that they are 'two separate meats'. For me, I don't separate the flat from the point; I just cook till the flat is just tender and juicy, remove the whole thing, rest the whole thing, then slice and serve the flat. The point I cool and save for further cooking later (as the base for chili; chopped finely for a sauce for, say, enchiladas or pasta; as a filling, etc.). Others here do what I suggested above: cook the packer till the flat is tender, remove it, separate the flat from the point, rest the flat, return the point to the cooker for further rendering/cooking. No fuss, no muss. Focus on the flat first; the point will come along just fine after separation and further cooking.