Fair point, but it is meant to stack up as the game goes on. You can get the player character's targeting rate to around 160% using the correct gear + the skill iirc, and other characters can utilize gear that lowers their targeting rate. For example Noel has -20% by default, but the skill could realistically add something like 30-40% instead.
Viewing post in Risk of Infection v3.1 patch comments
That kinda makes the skill pointless. For a team of 4, that means that the MC will only be targeted at most 39% of the time. That is borderline worthless for a tank, who is expected to soak up between 60-90%. This is why Yangus was so bad in the origional Dragon Quest 8, since he was built as a tank but did not have effective tools tobe a tank. It is better to have the MC spamming items instead.