What is the argument exactly against Hard resetting MMR on top of the LP ladder?

I mean games already look like this https://imgur.com/rBWTBko

why make some players lose the game from the get go and have others win it from the get go? whats the purpose?

if im fighting silvers i would expect to have my mmr inflated till diamond and reach it in 30-40 games i don't see the reasoning behind having to play against diamonds for silver and to have to play 100-200 games just to reach the elo i ended up in the season

on top of the champion pool changing the grid and economy the game is completely different thus making the grind a feels terrible

Hard reset the MMR and let me climb through the pits of iron and bronze again why make this unnecessairly difficult i don't get it...