The real issue is that Diamond is too inflated now. It used to represent something closer to the top 5–10%, but now it’s 35% because Apex softened the ranked economy so casual players feel progression.
The people that have been asking for this change are historically the top 5% of players(high Diamond, Master solos) who constantly get matched into 3-stack grinders/pros while getting gold/plat level teammates. It's just pred 3 stack massacring solo's with 20+ kills every game with 40%+ win-rates in whats supposed to be "competitive lobbies"(No joke watch any pro stream ranked).
So don’t apply solo-queue restrictions to all Diamond. Apply it to the statistical top 5% only.(D2+) Let Pred finally mean "best individual player", not just the most jobless 3-stack farming underpopulated timezones for 400 hours+ in six weeks while running down solo Golds~Diamonds.