This exotic is a cool concept but could have been executed much more deeper.
The class ability should become a grenade naturally without the need to change it but the barricade should have been elemental versions of both Light and Dark dependent on the subclass equipped.
Solar: Sunspot
Arc: Storm
Void: Black Hole
Strand: Weave of Threadlings
Stasis: Glacier or Duskfield Grenade
You could take a step further and change the layout plus elemental concept based off which barricade you chose ie Stasis Rally Barricade = Duskfield while Towering Barricade = Glacier.
Just a thought to improve the exotic.
The whole “Press you barricade button to prep it” gimmick is just stupid. Your barricade should just automatically be the Barrinade. You press one button and you chuck it. Done. I also think it should have a secondary effect, but something along the lines of: “If your Barrinade takes damage immediately after it spawns, you gain ability energy.” This way, you can throw it to protect your teammates and it will kickstart your ability energy again.