I'd heard there's debate as to whether the Wall was purely for defensive purposes, or also for customs and control of inner provinces. Are there any alternative arguments people know?

hi! not discouraging other responses, but you can get started on these

• some backstory: Why did the Romans prefer to build a wall in Britain at a great cost and then man it at an even greater cost, instead of simply conquering the rest of the isle?

• Just how hard would it have actually been to get over/around/through Hadrian's Wall?

• How accurate is the idea that the Roman empire ended at Hadrian's Wall?