That’s what I’ve done from the start of my wet shaving journey and shaving brush routine. Maybe it was initially done from laziness, but it saves in soap and it keeps my brushes more firm with backbone as I only soak and then load the brush, then face lather and then dry the brush upside down. If it’s a boar brush I rotate so I don’t use the same one for a few days to a week or more.I forgot to mention that over the past four shaves with this bush, I did not rinse the lather out after the shave. I just let the brush dry with the residue lather in it.
My theory with this drying method is that the drying lather particles will start to fill in any microscope holes in the boar bristles. Hopefully this will help to reduce the lather eating I was experiencing. It may be working.
The residual lather may even hasten the tip slitting .