You couldn't be sure if you had ran over something sharp, like the taxiway lights you just squashed, also a danger of ingesting FOD, or in extreme cases clipping a marker board or suchlike with the flaps or whatever.
For sure you will be found out at some stage, with most companies I believe in this case it ISN'T better to be hung for a sheep as a lamb, as the safety implications and therefore fallout will be of a very different magnitude.