Why would I need to? It isn't as if the cards become less flexible with Fandral. They still do the thing they did before and even more. What are you sacrificing here?
Important things.
Firstly, the ability to play them early, when Druid actually needs to. Are you going to hold onto a wrath or a raven idol while your opponent shits out minions onto the board? No.
Secondly as above, the ability to actually make use of what you draw. What is better at 10 mana? Nourish into swipe to clear the board, or this guy into nourish into "can't do anything else" and the mana crystals are wasted?
Living roots? Doing two damage and summoning two 1/1s on turn seven is nowhere near as good as killing a knife juggler or getting off to a tempo start on the first couple of turns.
Druid are not going to be holding onto the "choice" cards, and if they do they need them for a specific reason. That just leaves throwing the legendary out on curve and hoping it lives so you can do combos after. That doesn't work in hearthstone.
Also Brann just got that sweet Kodo buff.