By 'concrete type' I presume you mean common compression fittings...
Because even die-cast set screw connectors are rated for concrete -- if wrapped/ tarred.
The biggest user of compression fittings is the State of California. It's as common as dust for State contracts to specify that ONLY compression fittings be used.
They are also favored, by many, for exposed work -- inside a building -- that is at hazard for snagging the ordinary Joe with a set screw.
Otherwise, they are not favored... as they take more labor to install. The last time I looked compression connectors were rated at 250% of the labor burden of set screw connectors -- in EMT.
Compression RIGID fittings are termed 'Threadless Connectors' out my way.
IIRC, THWN-2 can pass inspection even inside raw Greenfield. My HVAC compressor is wired just this way. The whole neighborhood is, too.
In which case, there's not a whole lot of pressure to move away from the current line of threadless connectors -- for RMC and IMC.
I must admit that I rarely use even threadless connectors. The last time was for a fire pump room.
If given enough notice, I would've just brought a manual threader for the trivial number of joints I had to make up.
( 1/2 or 3/4 RMC is a breaze to thread.)