Great post EMIT, 99.9% agree with you.
Now, if the perfectly good airplane has been nicely landed right at the desired touchdown point, what else is there but to bring the aircraft to a full stop?
Landing gate satisfied, passed.
This is it, and from that moment on, after reverse thrust deployement, the aircraft is in a very low energy condition to decide to fly again, so there's an almost irreversible commitement to a full stop. If the runway was big enough to accelerate again, it would be big enough to stop as well, to put this in simple words.
Please, pay attention to posts like this, because this is the real description how flight progresses and how pilots work, this is not "in office" ellaboration.
Cheers