I suppose what that entails but in a general sense I don't think it's as big an issue as people make it out to be. If it was straight up raising people's grandmas to do battle.. then yeah okay, but if it was dangerously dark magic then not at all. We've already many jobs that are verging onto or already illegal, and many of those being quite dangerous.
Also I think it would be quite fun if there was a job that got the player flak for playing. Like they confront you on the matter and you can dialog back, how you would defend your choice of using such a dangerous choice of weapon. Of course depending on details like if you were raising grandmas for battle or not lol.. I don't think you could easily work around that. But if say it was some sort of new highly unstable creation magic harnessed straight from the depths of a shattered ascian soul, and that made them very uncomfortable.. and they balked at you for it, honestly I think that would be fun. I don't see why other NPCs need to approve of everything we do, or we them. So I agree if it's clearly dead raising as slaves but if we're just diverging into dark / unknown / very potentially dangerous magic.. meh I don't think it's an issue and we've already have quite a few similar examples in game (similar logic is why when I mentioned a sort of "dark" job previously I avoid pure raising of the dead because that seems like one of the harder mountains, but curses or other malefic aligned magic.. "depends on how you use it")..
I imagine when you said necromancy you were thinking strictly dead raising, but I think quite a few people also think of bone spears, poison novas, spirit magic, and other things associated with them (especially thanks to Diablo games). Which is where I think you could have a job that uses necromancy related concepts, but just not everything that they do- like some nations use nuclear power but ideally none of them use nukes on each other lol (so poison nova / bone spear / curses = nuclear reactors, while raising Ysholta's nana = nukes). Like Dark Knight in a sense uses necromancy (appears to at least within given buff names / themes), if they perfected their ultimate skill they'd become a Lich- but they kind of floundered it lol.