Why is leaving the soap on the brush a bad idea?
I've seen bunch of folks using hand waving explanations (e.g. imagine leaving soap on the head etc.) but IMO that is not a convincing argument.
I'd get a quick smack on the head if I said something like there is no way a naturally occurring stone can finish better than a carefully formulated synthetics (or will I?).
Seems to me that in 20+ posts, the only one that has actual extensive experience with this is DaveW and he sees no problem with it.
Is there anyone with actual experience who has seen deterioration in the quality of their brush or shave?
Or what is the basis for condemning the practice (perhaps health concern?)