I don't mind the hustle and the energy, it's just the overuse that gets me.
If you could guarantee him staying on the 3rd line with Strome and Slepy/Pulju, I'd be happy with that. The problem starts when TMac sticks him on a line with not just McDavid/Draisaitl, but also Lucic (or Maroon) and focuses Caggs to become a guy that needs to handle and make plays with the puck.
He's at his best when he's able to be a "little ball of hate", running around and creating mayhem. A lot like Pitlick, or even Lucic and Kassian. When you ask these guys to ride shotgun to McDavid or Draisaitl, or in a shutdown role, you destroy their effectiveness.
They're all 3rd wheels to a line. Same goes for Aberg, Pulju, Slepyshev, and Khaira.
This goes to a larger scale and beyond just Caggiula, as this is the Oil's big problem. They have too many of the same type of player, and are forced to use them in roles they don't fit.