By "control joints" do you mean expansion joints?
Can you elaborate more on both? Perhaps more toward pouring a shop floor
on foundation earth.

I'm referring to the ~1" deep lines placed across (outdoor) slabs of
concrete like driveways or sidewalks with the intent of their cracking along
the line 'control joints'...trying to control where the cracks will appear
(if in the event they do)
To me, "Expansion joint" is a black fiber product placed between adjacent
slabs which arent touching to allow for expansion and contraction.
They are seen between sidewalk slabs around here.
Then there are the ones inside in a garage/shop slab that are sometimes not
visible but still intended for the crack(s) to develop there later.

Two garages back, they put these in the slab. It never cracked. This last
one, they just cut the concrete. It hasnt cracked either 3 yrs later.

R

Then there is the metal expansion joint placed in stucco walls..