My concern is that once they check the whole building they find too much problems and that will be on file devaluating all the unit prices.
The worst thing you can do is identify problems then not get them fixed as both of these will be on record somewhere. Savvy purchasers will look at records of work done and feel more reassured than if they see a building that needs work but where nothing has been repaired.
I would follow the strata manager’s advice to get the building properly surveyed then get your claim in while you can. By the way, waterproofing is considered a major defect. If the builder drags their heels, take it to Fair Trading as they are much more active in this area than they used to be.