User blog comment:Aphostropils/Questions from a beginner/@comment-24251238-20160407043318

1) auto attacks scale off of ad, so ad casters can still do damage with their aa (varus, lee sin, pantheon to name a few) ap dont have that so an item like zhonyas synergizes well with their cooldown.  Also, an item like that would make fighters and bruisers so much more over powered, vi, hecarim, trundle, would stomp the meta moreso than now.

2) The meta shifts with each big patch and whats inside of the patch.  Tank meta is huge right now with the newest items and such, and it depends on who is buffed and nerfed as well.  New items, and certain champs being buffed/nerfed can change the meta

3) certain roles are impossible to make a reality, like tank/marksman because in that scenario they are literally the polar opposite.  Tanks need defensive stats (health, armor, mr) and marksmen need damage and attack speed.  You literally cant have both and be effective.  The closest you can get are sustain champs like trundle, vlad and graves right now, but in that case its very item dependent.  Vlad needs WotA and graves needs deaths dance.

4) always adapt.  Lets say you are adc and you build damage but keep getting stun locked.  Doesnt matter how much damage you have if you are dead.  Build a qss so you are relevent.   you have to look at the game and where you are and see what you can do.  Obviously adc should always build ie/reaver or something in their core items first, but always be able to adapt to each game