I think it is "normal" for cash strapped flying schools to spend minimum $$$ on aircraft maintenance and to leave some inexplicable items like excessive wing drops at stall to " it always has done that". Particularly with aged aircraft with a phone book list of ex owners and a less than clear maintenance history. I am not saying that this is acceptable, but I have experienced this with a few schools, and I think it is more common than it ought to be, at least in Australia.