The lack of taxi markings should have been identified by the operator's start up safety case and both the customer's and the operator's start up audits.
You really are an idiot. The tarmac would be wall to wall paint if every operator was to paint guide lines for the particular aircraft operated. Would be hell on a ferry flight, imagine all the tarmac audits that would have to take place.
Somebody please push a rock over the hole of SMs cave.