It does matter....
Counter-picking and team composition matters. Every time I tell a teammate in champion select, "Don't pick Blah because you'll be countering yourself," I get the same, "It doesn't matter at this elo," response.
That's very illogical. Let me explain something to you.
If you get 2 players that have never played a video game in their life, put them in a 1v1 match with
and
, the Darius is going to win every time.
If you take 2 B5 players, the Darius wins.
If you take 2 challengers, the Darius wins.
Any 2 players of equal skill, the Darius will win.
On the other hand, if the Darius is new to LoL and the J4 is a challenger, I'm 100% sure the J4 will win.
So in the case of normal/ranked draft matches, which uses mmr to create equal matchups, team composition and counter-picking is relevant. That is all.
and
but Nami is my best. I can play
if needed but I'm not the best with him
is my main. I can build tanky with a
and spin to win if my team fails at picking a good comp.