Just plain old lack of sales would be my guess.
A full-size pistol, say, a CZ-75, does nothing for me in 40 but catches my eye in 40. Ditto for a similar pistol in 45acp such as a Springfield Armory P9.
CZ-75, does nothing for me in 40 but catches my eye in 40.
Ditto for a similar pistol in 45acp such as a Springfield Armory P9.