Sadly it is the nature of these things that they are open to abuse and sharp practice. It will certainly sit uneasily to see a player take a blow then carry on playing before being withdrawn. Even if the guy is your top scorer in the innings, he shouldn't be batting on if he isn't fit to return after the break.
It also places the medics in a difficult position. It reminds me a bit of the situation the team doctor was faced with in the blood gate incident
In sport sadly people seem to fixate on WAAC. This leads to 'sharp practice' etc etc. Sadly, there is no one to blame other than whoever 'runs' things which at the end of the day, is the Head Coach and then the ECB Chair (or CA/BCCI equivalent). In these cases, those who are paid to be responsible should be held to account for the actions of their teams 'sharp practice'
Given amateur teams also seem to employ similar tactics in one way or another to gain an advantage in the name of being competitive it won't stop or be able to be stopped without overly harsh punishments which we know the ICC or down to local boards/clubs won't meat out through fear.