Locked screen vs unlocked

No matter what I try or how much I try, I cannot have a good game when I have my screen unlocked from the champion. I lose focus, have a hard time putting my champion in perspective to other things like minions and enemy champions. I know practice is the way to go but after countless botgames it's still not working out. Are there any specific tips or tricks for how to stay focused with unlocked screen and is it really that bad keeping it locked at all time? It seems that there's a lot of taboo around keeping it locked but I'd rather do so and keep an eye on the minimap for more accuracy than %%%% up with my movements because I can't tell how far away I am from the enemy and where I'm going.
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