The more expensive airsoft guns have some heft as compared to the transparent plastic ones. Also, useful airsoft training is conducted with folks who have significant basic skills and understand recoil from shoot houses.
But even they had some use. When I was a 'terrorist', I was captured by the law - I raised my long arm in surrender with one hand and as the officer approached, pulled my little transparent airsoft with the other hand from the small of my back and bounced a pellet off his face mask. The refereee said he was 'dead'. So is that lesson worth it? Might be more useful than muscle memory.