Uhm, you do know it's literally a molotov with a longer travel time right? As in if your in a building you will take just as much damage from it as if you were hit by a molotov. The only difference is that the delay on the throw for the molotov is longer by about half.
If throwing at 15+ range Molotov will hit first
If throwing at 5->15 Flame Grenade will hit first.
Tbh the OKW Flame Nade should only cost about 20 munitions in it's current state since it's a lot huger of an investment. And both the molotov and first truck upgrade are free.
You can't even throw the molotov at 15+ range. Also the delay difference is still significant, and considering how every second in the fire will take away some 15% of a squad's hp, the incendiary nade deserves a larger muni cost. Though I can't understand how molotov tech (sidegrade) and okw truck (main tech) can be similar.
Considering the nerf, it would be ok to reduce the nade's cost to 25 since the resource penalty is a thing.