I use to play some tour events, and only till recently have played AP 2's.  Blades all my life till then and I go after it and move some earth from long irons to short irons.  I agree partially, the CB's/AP2's are designed with a more cambered sole to help with turf interaction (slightly more bounce and not as sharp leading edge) where blades have minimal turf forgiveness so they tend to set up better to sweepers vs. diggers but if you are a scratch or lower handicap, it's all up to you and your feel/preference.  If you are a higher handicapper, do yourself a favour by checking your ego at the door and CB or AP2's should be the minimum club from Titleist you use for forgiveness.  This game is hard enough, have FUN and make the game as easy as possible.  Hope this helps???

Cheers, Mike Y