My engineer calls for 6×6 mesh placed at mid-slab on supports, and has drawn control joint locations.

Joe Lstiburek recommends fiber-reinforced concrete with a water-to-cement ratio of less than 0.5, and control joints, because he says no one ever puts mesh on chairs anyway.

Can GBA Pros provide best practice guidance? If fiber, is there a standard I can use in my notes?

Also, does the advice apply to exterior hardscape?

Building Zone 4A. Thanks!