new player unrankde adc vs s2 adc that play the game for 5 ses

https://imgur.com/a/1u3uASM so can i ask how un unranked new player i think he main mid but got adc in placemnt match he play vs an adc that play LoL FOR 5 YEARS and he get a unlucky feeder sup the game is over i know but riot in the next s9 new ranked system shoud place new players with new players in both teams so this will not happened in s9 rank