I've never dumped ash, just tamp down and re-light. I'll experiment with this and see what happens
+1
I just gently tamp and relight where necessary, then dump the bowl when I'm done.
The bowl size and amount of tobacco packed into it will change so much of anyone's technique.
Most of my pipes aren't too dissimilar in size, as a really rough gauge about the size of my thumb and 2/3 the length is the bowl size of probably half my pipes.
A really deep or wide pipe I'm sure would change my entire process.
Ultimately do what you feel is necessary to enjoy, or simply what you enjoy full stop, so you can enjoy yourself, no-one can say there is a solid right or wrong answer... Especially for this topic.