Why? I'd say in reality the vast majority of almost everyone's life is non-seedy. Having some kind of parity(or increasing it past past games levels) between non-seedy and seedy elements detracts from realism IMO.
And in reality I'd say the vast majority of us don't go around waving swords or throwing fireballs :shrug:. And neither do we have to deal with living in a world without electricity or the internet. And in reality there are definitely parts of
every town that has some some sort of underground drug/similar themed culture.
I'm not saying I want it swinging in the favour of seedy, it's just that in Oblivion the emphasis was heavily on the non-seedy side. I'm all for bakeries and potteries and all manor of similar establishments, but not at the expense of not enough seedyness. Of course it's a difficult balance to strike, but fleshing out the darker side of society would be nice. Especially when all of the everyday activities you see on the street compared to the seedy stuff you won't see (obviously because it's seedy) give the impression that every NPC is a perfectly honest.
EDIT:
Why make a thread for the prosttutes? Why not the Tinkers, Cobblers, Scribes, Architects, Brewers, Vintners, Weavers, Ratcatchers, Furriers, Cooks, Astrologers, Healers, Tailors, Minstrals, Barristers, and the Syffim?
Well it would be nice to see all of them in, but like I've said before, everywhere you look there's honest people doing honest work (the above guilds you mentioned), so you don't really need
more honest people doing honest work to give the impression of the honest members of society, but you do need a seedy side to flesh out the poor quarters. Taking the arguement against me used above, what you're suggesting (including all those guilds and not prostitution) pushes the world too far towards the black and white depection of society. We need some greys.
On a similar topic, another thing that would be nice is rival guilds trying to undercut the others, such as two smithy guilds hiring thugs to bash in the opposing guilds smithy. Ideally this would have an actual effect on the game world and NPCs and such. That would also be welcome and grey,