My suggestion is very simple. Remove the “directly” tag from the node so it works with everything.
The reworked node for smite with the chance to spawn a void beam is actually a great addition for caster void knight. Sadly its only for active usage of the skill and while you can use it in a purely manually smite cast build many other builds miss out or you have to squeeze a smite in the rotation with the hope that it cast the void beam.
There are many builds that use auto smite : Multistrike, throwing skills , palarus unique, javelin, lunge and so on. All those builds will only benefit from the extra layer of damage.
There is already a limit of 2 beams per 2 seconds so it wont affect anything performance-wise or break the game.
I think that other players will welcome this kind of change.