I think the warning is good when playing vs someone with equal quality. When I'm in top few leagues I assume the players I'm competing against are also trained correctly. So my guy with max safe tackle and tackle could be fine against a low pen guy, that is totally different when all are trained. But it is always, regardless of the level, merely a guide and your goal shouldn't be to outright avoid all warnings. Rugby in real life is tested, some sirs let you keep your hands in the ruck for .1 seconds and some for .5, and that needs to be tested to see which it is. Some sirs will call a penalty when the scrum half throws the ball intentionally at an off-site player making an effort to release, but Wayne Barnes is the only one I know of.