[amsat-bb] Why too much uplink power is bad

Can someone explain to me why it is a bad thing for the satellite to have too much uplink power to it?

Even if you send a huge amount of power up, I don't see how it could damage the satellite, by the time it reaches the sat, the power would be so low.

Is this only something for the linear birds, does it apply to FM satellites as well?

Thanks Skyler KDØWHB