EDIT.

You're part correct. Yes, the take-down plate/bar does help absorb recoil and also keeps the rear of Slide-Spring Bar in proper placement, but ONLY from spring compression to help keep the Slide under fired/unfired control. The weight of the spring helps control the Slide's delayed reaction under the firing of bullet to not open late/too soon.

You CAN use heavier/lighter springs than factory stock, but you also have to use the correct ammo's with these type springs to prevent any danger or damage and still have reliability, longevity and safe shooting.

With the Galloway system as of now, the springs are being compressed into a single block of metal too soon and not letting the slide fully open under recoil and thus breaking the frames.

I own a 9mm and 40cal. fired guns. While the 9mm might not have as much force to maybe create the frame's breakage that the snappiness of a 40 will/can do, the springs of both are too long and not doing what they're designed to do, and that is "spring" at the correct time under full recoil and making another part take the brunt of the force, that wasn't designed to do.