It's good that you used the fiber mesh. The nice part about it is that shrinkage cracks in concrete are almost nonexistent.
15 years ago when I re-did parts of my shop building, I specified using fiber mesh for the poured concrete, radiant heat floors. Because I move around very heavy objects on car jacks, engine hoists, and custom-built engine stands with small steel caster wheels, I specified no expansion joints.
Plus I wanted it as extra protection for not stressing the heat pipes. There was some concern that the radiant heat floor's hot/cold cycling of the floor mass during winter as the hot water gets pumped through the slab when there's a call for heat, not only puts extra stress on the slab, the movement over long runs of pipe can wear on the plastic tubing in the concrete maybe shortening pipe life.
The biggest slab is 24 feet long x 22 feet. There is only one hair-line crack down the 24 foot long center line. That was the stop line of two radiant heat coil "zones" and it was also done as two separate pours hours apart on the same day. You have to get on hands and knees to see it. For shrinkage per foot, there's about a 1/4 inch gap on each side where it was poured up to the wall sills.
The down side was a "hairy" looking floor for a few months, that made broom sweeping not as thorough as it could be until the fuzz got scuffed off by walking on it. One of the contractor's workers calls them "gorilla floors".
The 24 x 14 slab in my paint booth has eight anchor pots imbedded in it for chains to attach pullers for frame straightening. and no cracks anywhere in it.