Can we just not dispose hidden mmr completely and have one true competitive rating only?

Like if you're rated at plat 1, let the system treat you as it is, being placed while q'ing at close rank rating matches.

Inflation can solve itself on its own since if you don't belong in that rank, you can go down on your own by losing again and again. If you can stay at that rank then it means you're there already. Let hardstuck be hardstuck since that is where you truly lie. If you still win on your current rank then you go rank up until you can't or sits at lose win lose win situation.

Just make it simple, one TRUE rating for all. Why have a hidden mmr and have a badge on you with different "act" rating at all?

Let your wins reward you and your losses deward you.

Even if its at fixed rate +25/-25, this will still be better for most scenarios. Like the system of dota, there's only a fixed rate for winning and losing. Riot can add the so called performance bonus if you win on top of the fixed winning mmr, so if you over perform, you get your merit. Let the grind for ratings be actual as it should be.

If you got boosted to your rank, then you have no other way to go down if you don't belong there. Also as if boosting is not a common thing after all, boosters and smurfing are there, for the long haul.

This way, no one will ask anymore why does one lose more and win less, hopefully.