So its bad just because you cannot perma fear/kill other guys just because they are on mounts? You decided to play necro, which is certainly in top 5 OP classes on classic, their biggest disadvantage is they are human mystic, who has lowest base speed of all classes, so you have to deal with it. Benefit of mounts? Faster movement to get on your farming spot, faster checking for enemies on big landscape spots, possible to get some time for regroup once you see enemies comming for you and you