And they'd not have got the penalty they got at home.
As you say, every team that enters has the same rules. They know that VAR will work if some teams are drawn at home. Everything is evenhanded.
If it was in any way unfair, it wouldn't be part of the competition at all.
The infuriating thing is we had the same deal with goal line technology, and no one ever complained that some grounds didn't have it, everyone was just smart enough to realise it was just as likely to help/hurt each side.