Fiberglass durability is a big issue for glass over plywood bottoms.
If the glass gets nicked the plywood becomes a sponge, so it's important to (dry out) and patch all nicks soon after they first happen.
If glass over Plascore gets nicked it's no big deal. I have a plywood fiberglass boat with a Plascore bottom panel I built in 2007. I didn't patch the split chine until two years ago. When it was 11 years old. Much of the chine had been split for six or seven years at that point. No big deal. There was no soggy wet plywood to fight with.
NOTE: about the Plascore bottom boat above:
The Plascore bottom panel is only 3/4" inch thick, so the plywood side panel is only 3/4" inch up from the bottom surface of the boat. After 11 years no chine splits on my boat had migrated up that magic 3/4" inch to expose any side panel plywood. The damage was all right at the chine corner.