the skins aren't watertight so even if they have a few holes, you can just patch them like old clothes and still use them. you can glue some ballistic nylon or cordura if it is due to wear.
the drycore is pretty straightforward to patch if needed by a drysuit repair shop, not sure on the newer aircore
and seals are the same as any trilam suit, where you could get glued seals but having a sitech system is really recommended
fusions really only have that they are a bit more forgiving on sizing going for them. this makes them an ok option for rental fleets or a cheap used suit. otherwise, a made to measure trilam seaskin is better.
i've been diving an ex rental LDS fusion for 8 years now. 3rd set of seals.