It's only a problem when we insist on buying heavily customised, complex weaponry. The (now cancelled) submarines for one. You would think someone in defence would have learnt from the Collins Class or even back as far as the Avon Sabre, but nooo.
Conversely when we buy off-the-shelf equipment it usually works well. The RAAF has had virtually no issues with the Super Hornets, Growlers, or C-17s. The navy seems to have done OK with the Canberra Class.