How about steel studs for inner double stud wall?

[Albion]

Was wondering aound a Menards and saw steel studs and hou some are less then 2 by 4s was wondering if this would be a easy non load bearing inner stud wall taking less space and easy to retrofit an existing dwelling? Was quized why not leave the plaster wall when creating a double stud wall on an old home when the existing wall is filled with cellulose? My answer was to be able to observe an correct any framing issues by exposing the old studs. But got me wondering what harm in leaving the plaster? What insulation value or thermal break possibly?

[dgbldr]

To the first part: Yes. But shallower studs will hold less insulation.

To this part:"What insulation value or thermal break possibly?"

Perhaps you can put that in English?
Double wall needs no thermal break, you offset the studs. Insulation value of plaster is zero. But there may be a plastic sheet behind it, which you may or may not want.