To add to it, qc of mesh placement is very difficult and typically not in the right spot in the slab. Not rigid enough to chair up like rebar so sometimes it gets pulled up into the slab during the pour. Most of the time it is sitting on dirt with little to no concrete cover.
In a 1 way reinforced slab on grade, you're looking to increase the flexural strength of the tension side of the slab (the bottom). So you want the reinf as far down from the neutral bending axis with enough conc cover to protect from corrosion. Mesh is better than nothing but sucks for achieving this due to what I wrote above.
Much better solution if needing some reinforcing in a thin slab on grade is fiber mesh reinforcement.
Again none of it is a replacement for good sub prep.