Pretty much all shotshell wads have been plastic for the last two or three decades. The biggest thing involved in cleaning shotguns any more is getting the plastic residue out of chokes and forcing cones and brushes alone won't do it, there are spray chemicals for the purpose.
Other than that, I can see steel shot but no way am I ever running anything HARDER than the barrel of any sort of weapon through that barrel.
The BlackCloud ammo eliminates the most major concern most people have about steel shot in the sense that it does not require tight chokes, you basically just use the skeet or IC choke(s) in the gun.
Why they don't allow nickel-plated lead shot for waterfowl is still one of life's mysteries to me at least. The plating doesn't come off or crack even when you squeeze the pellets with pliers and the possibility of ducks or geese ever poisoning themselves with it are exactly zero.