Incisions heal by forming scar tissue. The rectus abdominis muscle that is
cut for an open cholecystectomy heals the same way. Pretty much as good as
new, over time. There is a risk of a separation of the fascia, which would
result in an incisional hernia. This is a small risk.

As to inguinal hernias, I agree that non-symptomatic hernias that are at
small risk for incarceration/strangulation don't have to be fixed. However,
no muscles are cut in an open inguinal hernia repair and the concept that
such an operation might somehow affect muscle tone is completely erroneous.
Bilateral inguinal hernia is an indication for laparoscopic repair, in which
case there is virtually effect on the abdominal wall at all.

HMc