Sure, but if repeating rifles could give a regiment the fire-power of a brigade, a brigade the power of a division...?
Seems like somebody would want to do the math?
Somewhere I read that Lincoln himself was interested in better weapons, and that Jefferson Davis' personal security guards were armed with Sharp's rifles, and yet somehow the ideas never went much further...
What you say is true. However the effective range of Henry or Spencer weapon is considerably shorter (100-150 yds. vs 300-400 yds.) than the Springfield or Enfield weapons. The ability to manufacture millions of rounds of copper or brass cased cartridges had not be developed by war’s end.