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PeterP said..
As long as board does not delaminate then there is nothing to worry about. In fact, I prefer mine when they start developing slight indents, it helps sensing the sweetspot and becomes like an old favorite shoe.
Er...a different view...a older small surf factory advises, the (usually) epoxy shell is like a eggshell...once compromised...then the boards strength is reduced....if advanced, look for stress cracks across the RAILS adjacent....one major manufacturer (at least) spins the same lines as above. (I sold one SUP 2 weeks old and had another brand replaced under warranty)
Here is one lower-end mob that are trying...(no relationship with me...don't own their boards either)......carbon reinforced foot pad...kevlar rails for lateral strength. (no idea about performance...surprising finish.....see a few in northern NSW/QLD)
www.thesurfboardwarehouse.com.au/sups/