Join Date: Jan 2009
Location: Worcestershire, UK
With the new rules daemons pretty much must take a BSB. Losing a combat by 1 and then rolling 6,6 would mean you're whole unit disappears... while with a BSB you have almost no chance of that happening (1in1296) while having a much better chance that you unit recovers all lost wounds.
Since heralds are going to be in every daemon list anyway its not a huge cost to just add the BSB. Sure you can't just throw on magic banners any more without changing your build (and lets face it, daemonic gifts is why you take the herald) but just adding a plain banner is an almost laughably easy decision.