Some of them were indeed close, but some sideline shots were out from perspective in tv replays. LHI didnt protest any of it, maybe he knows that too.
Human makes mistake, as long as it's not intentional and bias then it's acceptable. Yes, technology is there to minimize the mistake but WBF think it's to costly to implement which is strange. You don't need the one like tennis but at least have few more cameras on side/base lines as stater. Take one small step at a time to eliminate human mistake/bias rather than just claimed not do-able!
Everyone can see the controversy is on the horizon when Olympic comes but not one is taking any action, go figure!