When we built we had floating floors put throughout the whole house..not a square of carpet anywhere and tile only in the bathroom and laundry. We were told to be extra careful of a few things like water spillage should be cleaned immediately otherwise the boards will warp and look icky..this extends to not leaving windows open if we can't get to them immediately if it starts to rain, careful of vacuum cleaners to ensure the screws on the head are tight and don't scratch the floor..i've not had any issues with water damage in the kitchen however, we had one of those big puzzle mats on the floor in the lounge for ds and playgroup time and i didn't move it for a couple of weeks but when i did i was so upset to see the edges on a few lifted as somehow liquid had seeped through the mat into the boards..if we were to unclick the boards from the wall to replace the damaged ones i think we void our 25 year warrantee (as in order for the guarantee to be effective it had to be installed by the company).
However for scratches we have a "wax stick" which works a bit like crayon in colouring the floor back to it's original "jarrah"

bbl to finish my post!