Hmmm???
Steel can withstand more pressure than brass.
Steel work hardens faster the brass.
Steel can be annealed to mitigate the work hardening for getting cases to last longer.
Steel doesn't conduct heat as fast as brass and will take higher temperatures and/or more time to do the softening ("annealing") of it than it does for brass.
Reloading steel cases is going to take some adjusting for the annealing approach, being it's so different from brass.
And I wonder how the Nickel plating of steel stands up to resizing compared to Nickel plated brass???