I would suspect that the biggest issue with electric impact tools is weight!
The electric tool must self-contain whatever mechanism and power supply is needed to drive it effectively...and that's a lot of stuff to heft around!
At least for air tools, the compressor is the power supply and is remotely located...not strapped to the tool!
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car