Suppliers suffer from a constant flood and drought of contracts. Crisis -> We need so save money -> Supplier contracts are frozen or cancelled -> "Oh, we can't do stuff ourselves/We need help" -> Supplier had to let go experienced staff, hire cheap/unexperienced replacements/outsource -> Quality suffers and costs explode -> Repeat. Also not paying/delaying payments drives more suppliers out of business.
You also better promise the impossible because the cheapest offer wins. One time I got a PowerPoint as the technical drawings for electric charger test station. Just some black boxes, lines and names. That was the documentation. I should help the project management with documentation of the current state, but had to provide quite a bit of engineering in addition. Also had to talk to the Chinese supplier directly (nobody in the team spoke Mandarin). What a joy.