I think the ranking pool isnt technicly the issue

low tier ranked is to demotivating for general players starting to dipping there toes into pvp.
if they yoyo 1-2 days without accomplishing any progress (which in Crystal conflict, doesnt even has to be there own fault in those tiers, no real chat function doesnt help getting any useful feedback either),
why would they return for more?

the result is new blood is drying up, which leads to higher que time in low tiers,
which leads to even worse experiance, aka even less new blood.

i would argue low tier has to be less punishing when it comes to the ranking yoyo, and than gradually ramping up the punishment for losses till diamond or platinum
so that new players can have somewhat of a hook that motivates them to aim higher and keep engaging in ranked pvp.