You're complaining about a simulated spec not taking a talent that would have no impact whatsoever on the simulation. Think about that for a moment.
Still not sure why OP lists destro spec with Imp SP - you don't even need simcraft to see that BoH is worth spending one point, when the point you're taking it out of is never cast - look at the priority list:
Where is searing pain? Nowhere, it's not cast. As far as simcraft is concerned, neither is BoH - on a Patchwerk style fight. In current content, there are enough encounters with multiple mobs that there is no reason whatsoever not to take it. You lose nothing by taking the point out of Imp Searing Pain, a spell that is never cast.
As an example, here's a breakdown from a BoT Ascendent Council attempt (5% wipe QQ):
300k (8% dmg) for 2 GCD. Can someone please explain why this is not worth taking when the sacrifice is literally 0 DPS??