Infuse Weapon feels underwhelming

I'm running Spire of Ire with the Elemental Infusion ascendancy, consistently having 6 of Chaos, Cold, and Lightning infusion, and I'm disappointed to find that projectiles can only affected by one infusion at a time, rendering the ascendancy very reliant on Barrage if you have high uptime, and making the Infused Avatar node literally worthless. There also seems to be an edge case where no infusions apply, but I'm having trouble reproducing that.

This problem is made worse with how only 3 Spear projectile skills can actually have their projectile count modified, and doing so is actively detrimental to 2 of those skills (Whirlwind lance, Storm Lance), and infusions are a crapshoot on twister as it only triggers at the end of the flight.