Something else entirely. The original Forbidden Fist attack, mechanically "under the hood", works like a melee ranged spell: it has its own base damage, penetration and so on. It isn't considered an attack with a weapon because it simply lacks the proper code tag. It doesn't use weapons stats of weapon you carry or anything. It just uses its own stats but simply lacks a tag/keyword a la "melee weapon attack". This "spell" howver profits from Transcended Suffering (which scales it) and other bonuses to unarmed attacks (because it is tagged as unarmed - but not as weapon attack. It's an unarmed melee spell so to speak).
Because of that, abilites which would trigger on "weapon attacks" won't proc if you use the Forbidden Fist attack. That includes Swift Flurry and Heartbeat Drumming.
Soul Whip's Focus gain also wouldn't work (a Forbidden Fist/Cipher won't get focus when attacking with the Forbidden Fist attack), Berserker/Forbidden Fist wouldn't have the Frenzy hit-to-crit conversion with Forbidden Fist attacks and so on. You also shouldn't get Lightning Strike's and Turning Wheel lashes on it.
The oly thing that the Community Patch does is to give the Forbidden Fist attack a proper tag so it counts as a "melee weapon" attack. Like your other fist attacks (auto attacks and attack abilities like Force of Anguish and so on) also are.
I personally believe that's what it's supposed to be. The implementation as a quasi-spell seems to be an oversight by the devs. But we cannot know for sure.
By the way: Inner Death (PL 9 ability of the Monk) has the same behavior and also got fixed in the same way with the Communty Patch.