I have once tried aim-labs, didn't find it quite useful(I might be wrong)

I'm currently playing at D3, sometimes I go back to D2, but I can comfortably stay in D3, and I have once touched A1 as well.

I'm wondering if it is absolutely necessary to train my aim regularly via these methods? I usually play one death match before I queue for ranked, and although my aim is not the best thing about me, I can get around in other areas such as lurking, reading enemy team's plays, and just W gaming. I play all agents, raze being my main, then brim and viper, and cypher and KJ.

has anyone here climbed to higher ranks without using aimlabs/shooting range extensively?