User blog comment:TheTobarMethod/Why you SHOULDNT follow Pro's./@comment-85.246.224.187-20130219052527

Depends on the situation really. Using OP's example, you don't have to use skills to farm as Orianna, especially if you don't want to push your lane. But there are cases where you would not get a cs without using an ability or you just want to push your lane for various reasons, in which case you should use your abilities.

Another example, in which you should follow what pros do, taking Archangels on Ori every time is bad. Not only because Archangels is bad on her (it's actually good, especially this season), the problem is that it might not be the most appropriate item for the situation. Sure, sometimes it can be great if it fits your playstyle, but not having flexibility on your build is bad and you're basically crippling yourself, even if you end up winning. If you don't know what items are good in which situation you should learn it if you want to be a better player.

TL;DR: Take what pros say into consideration but use your brain as well if you want to play to your full potential.