Tyrant

The point is that if someone really is damaged from an attack, it is usually announced. Goku states Frieza is getting weaker to the point where he is not even a challenge anymore, the disc that cut Frieza, Vegeta weakened so much by the Spirit Bomb that he can't even take great ape Gohan etc.

Physical damage is not always a sign of Ki damage or if it is it can be considered neglible. Most Ki Attacks concentrate the latent energy in the body and release them from a single spot so getting a hand cut off wouldn't weaken the attack by much.

Goku even stated that Gohan's broken arm against Cell was not holding his power back, it was merely his own attitude that made him think that it did.