The number of parents who come to me with a bat that has sustained a small surface crack that they find 'unacceptable' as the bat is 'only a few weeks old' is frustrating. Especially as they demand a replacement, despite me offering a free repair myself or the option to send to the manufacturer for a repair - no chance of them saying 'oh this bat is stuffed we will replace it.'
If a hockey stick or a tennis racket etc sustains damage early in its life then yes it should probably be replaced. A cricket bat is made of wood, it was once alive and growing out of the ground. During normal use It will naturally sustain minor damage. A scuff sheet is the best way to reduce the risk.
Did a mid season refurb on a spartan for a teammate last season.
One of the grains had "opened up" perfectly, and there were a couple of small surface cracks under the scuff sheet.
As it was "broken" he borrowed a bat of mine and left it with me.
I repaired it, but as the crack was still visible (if you knew it was there, at a glance you couldn't tell) it was to his mind still broken.
Because of this he took it back to the shop he'd bought it from who had a look and said "it's a bit of wood, they do that, it's fine"