The way ranking actually works, the placement matches needed to go up and down rank, it needs to go

I dont know if this has been brought up, but i recently saw in a post the dev's are trying to do something about ranked, has anyone ever floated the idea of just completly getting rid of the placement matches needed to move up in ranks(the placements before the start of the season are fine), im just talkin about those placement matches that need to be won, so i can go from bronze III>II,

I dont understand why this is even in place, how does it serve the community, example, I won like 4-5 matches in a row, get to bronzeIII placements, lose 2, down 34 lp, why do we even have this system, Overwatch just has players compete and you get ranks based on just winning or losing, not doing some out of date placement matches where if you lose, your way down. So i did see recently they give 1 win sometimes to get past it, how about just getting rid of the whole system, and making it just based on Wins and Loses,

can a dev give me good reasons why this system is still in place and how it benefits Ranked Players and Ranked Games

Thank you