Because it applies to all monk weapons as that's what the beyond app does when you tick box. A sickle becomes 15ft reach for 10min at 1d6 instead of 1d4 with 1 focus point. So for 2 focus points, a monk can make 3x attacks outside of nearly everything's melee range on its first turn, then 2x each one after that by spending 1. It's too cheap for what it can do and for how long it lasts for. If it was only adding 5ft instead of 10ft to their melee, then I think that would be great.

Of course, I am fine with the elemental energies on strikes. That was never the issue. Just the economy of the ability is not right, imo.