Should hardwood floors go all the way to wall under kitchen cabinets?
It's not the end of the world, but you might consider cutting the pieces so the gap is smaller.
Why?  Some cabinets sit on the floor via little legs.  If the legs were to be exactly where there's no flooring, it becomes uneven.  You'd then have to put something under it the right thickness, which just happens to be your flooring.
If it were me, I'd spend the extra few minutes and rip the pieces to within maybe 1/4 inch of the wall (for expansion/contraction).