without forensic levels of scrutiny (impossible in practise) there will always be "judgement" by human(s) in certain situations. Other major sports reduce this by using technology such as multiple cameras that are big-screened almost immediately. Very little wriggle-room, much less controversy. The excuse that football at every level must be controlled exactly the same is a piss-take.
The use of an imaginary t-shirt cuff as a yes/no decider is another can of worms. T-shirts are not made to strict rules, which part of the ball makes contact, was there intent, was it arm-to-ball or ball-to-arm, is it even a consideration. What-ever, on the numerous occasions City have been on the end of controversial decisions, the level of outrage and scrutiny has never ever reached this level. Scousers playing the victim card is as predictable as night follows day, yawn, but this has been a pile-on of epic scale.