A void in a slab is proof the tree was alive and imperfect, same as the rest of us.
Every board I work with has a history written into it — cracks from years of stress, knots where a branch used to be, gaps where the wood simply pulled apart as it dried. I don't sand those out or pretend they're not there.
My job is to work with that shape, not against it. If a piece has a natural wave running through it, like the console table with the S-curve down its length, that curve dictates the whole design instead of getting planed flat and forgotten.