Well Netero does have a limitation on his 100 type he has to bring his hand together before he can attack

that would not be a good idea what if he had to fight some of the royal guard before he could face the king he would be fuck which is what happened in the story Pitou attacks him if he could not use the 100 type on anyone but the king he would not have been able to stop Pitou

the problem with limitation as Kurapika master said if you break it you could lose your nen that why when making abilitys you have to create powers that don't have to big a limitation Killua and Gon talk about it at the start of the greed island arc when there trying to create there abilities