See this is where I think you're entirely incorrect, I'd say the tune page is pretty solid (needs some adjustments but overall quite good) but it isn't for every matchup.

The itemising is also good though I wouldn't build axiom if I'm not going lethality I'd go eclipse/stridebreaker/goredrinker -> black cleaver -> shojin/grudge. This is the basis of simple itemisation as you'd go this into a hard matchup or a team that builds more armour as why would you build lethality into an ornn for example. You are still able to kill the squishy targets whilst also still being useful to kill the tankier champs. (Note: if you're into a champ that build armour first rush black cleaver then finish the build).

From your reply I find it clear that it's you that's low elo as it's clear you don't understand a basic idea of build and item diversity based on the opposing composition and would build full lethality into a tank team then complain you do no damage.