If i ever played PL instead of points, (and I had the bits), I would totally run 10 SG w/ all Inferno. Look, I know we're Blood Angels, the whole "Descent of Angels" things is literally in our blood, but I think people get tunnel vision with that sometimes.
For me, Inferno pistols are amazing (now that they cost 9pts instead of 20) in Turns 2+ when lines have smashed and you have units all up in the enemy's forces. Taking out that Manticore with a few Inferno shots while on your way to cut up the enemy HQ can't ever be underestimated. Or, if you are just straight-up going Elite vs Elite, I don't know if there's a single (non-HQ or LoW) unit choice in the entire game that can put out as much damage as Sang Guard with inferno + encarmine weapon or fist. Anything with multiple wounds will die as the sheer volume of D:D3 or D:D6 attacks stacking on them will ensure that something gets through even against 3++ or such.
Again, for points reasons I am not actively advocating anyone to run all Inferno Pistols, but if you ever did have the elbow room, please please please do not dismiss the concept out of hand.