Question for Rito: Do You Agree with Hit-or-Miss Champions?

This isn't a QQ thread or anything; I just find that with certain champions the first 10 minutes determine the whole match. For example, if roams bot and secures a double kill she will absolutely carry the game. This is very certain because she is manaless and her one weakness (lower damage early game) has now been negated since she can buy raw damage with the huge gold boost she just got. So now she is even in damage in lane but with no mana. If she doesn't get a kill for the first 10-15 minutes she is useless all game.

Some other champions I find this true with: etc.

Basically champions that are nothing but damage and offer no utility.

Is this intentional? And if so why? The game becomes very one directional after a mere 10-15 minutes with these champions and one laner is usually stoked and one is usually stressed out...