Regarding live classic vs P99, it was purely because of resist difference, and it is huge, not because people didn't know the how to take advantage of root mechanism back then. It also works both ways, NPC can almost never land a root on a player reliably, unless the NPC is a red con to the player and player barely has any magic resist gear.
Problem with caster casting root hoping to make it easier will have it resisted most of the time or break off very fast, then with 5-6 casts there is no way a tank will be able to taunt the mob off the caster, so eventually either the caster or NPC will need to die.
Problem with earth pet chain rooting also meant that root rarely reliably stuck, so the NPC will first be on tank, then when root sticks, now it will turn to whoever is nearest, then when it breaks, its back on tank etc, then also made re-positioning and switching target very very difficult, often times that NPC will just end up fighting the earth pet alone when switched, then when the pet dies it will just go straight for the Mage until the Mage dies.
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