The 3 teams that came down last season, aren't usually as powerful and well equipped.
Leicester for a start should never have been relegated with the squad they had.
The 3 that gained promotion last season too, didn't do a 'Fulham' or 'Forest' and chucked £100m's in the summer to try stay up. They invested in good Championship players instead.
The 3 coming down this season (Sheff Utd & Burnley will, and Luton will likely join them) will make the Championship 'easier' than it is this season, by some distance.