However the offhand mentions in ANH were not essential to understand to make sense of the film, Obi said he fought in them and Luke was impressed.
I never saw a person complain or ask WTF was it?
I actually saw reviewers complain that they did not know what a sith was or why they wanted revenge, also what did Yoda mean about if they found one the master is still out there? Would it have killed them to have Quigon tell Obi about the backstory?
I guess it might have been interesting if someone had looked over Sully’s contract and said “You agreed to this? You had them over a barrel - they’d already spent $100 million creating the avatar for your brother - you could have easily demanded $10 million and your spinal surgery and they’d have had to pay it. Instead you took a measly consulting contract. What are you, some kinda moron?”