I often have to dump ash during a smoke. If it is right in the middle of the smoke, then what comes after is not nearly as tasty, usually. So I could see how some would just stop there.
But some tobaccos still taste decent after the halfway point.
When I do it, I use the pick to gently loosen the fine ash, then I turn upside down and dump. I may do this again, if I discover there is some fine ash even deeper in there.
I then tamp, trying just a little to bring down the sides, if they are up too high.
However, I have learned NOT to stir the sides down, because apparently that usually lets down fine stuff that then obstructs the draught hole.
I definitely come across the situation often where a relight is difficult. This is usually where there's too much ash built up, and dumping the ash makes it light easily.
But ... I've just been at this a year, so my technique may be missing some crucial elements that the vets do well.