There's validity in practicing with a .22 for ease of use (less fatigue) and lower ammo cost. Having a Glock with the same mechanical functionality, similar feel, and Glock reliability (assuming it does) is a great training tool.
These advantages are reasons .22 conversion kits for full-size Glocks may be popular.
If practice with a no-recoil laser system builds muscle memory, better control skills and the familiarity of the "feel" of the pistol in your hand without expending ammo, a .22 is a step up, adding the mechanical practice of loading, reloading, clearing any malfunctions, etc.
JMHO