Open has faster queues, fewer constraints, more options, higher skillcap.
Those are objective facts. “quality” is a subjective and moot point. And we lack evidence to discuss popularity with any detail.
So OPEN can do everything RQ can do, and largeN more. If people don’t like something (too many dps) let them be the change they want to be. If they don’t care enough to LFG, swap, or round-out the comp - who are you to lock them down forever always? RQ protects terribles that expect ttk padding and mistake-buffering from a scripted format.
RQ wins no combinatorial arguments. The mode was a layoff-worthy design move. Match quality (and meta) is always a gamble. Handcuffing your options after really long queues and 2/3 roles bribed should never be a gamble.
Depending on others - even forcing them via lockdown (and expecting less toxicity) - to round our the comp for you, or depending on a rounded comp for your progression - is just irrational. Depending on altruism from strangers in a video game loses to the robustness of self-serving, self-carry agency. Open frees you of these things.