The too short main quest and the problem with side quests

I agree with this statement, it doesn't make sense.

Would it change things if the quest giver said something like: "We desperately need someone to go to the Necropolis and investigate, but you don't seem to be the man for the job yet. Come back when you've learned the ways of New Britannia and need not fear the horrors that besiege our land."?

That way, the new player would get a hint that the quest gets difficult at that point and can choose when to return.