It was never about randomness but about decreasing waiting times.
They knew it would be unpopular with many, but they also knew it was one of the few ways to effectively reduce waiting times on PC (the platform that’s suffering the most), by joining most of the playerbase in one queue as opposed to three. On that end, it did work (on the Casual mode anyway), but ultimately the cons it created have been almost as bad.
I can’t blame them for trying changes and then recognizing said things didn’t work.
Ultimately I’m sorta glad the change is being rolled back even if I had no personal issues with the new system, if only because it was rather uncomfortable to be playing with people that were clearly annoyed at being stuck in a mode they didn’t want.
I’ll miss the faster queue times though… really hoping they loosen up that ELO range, since it’s not like a tight one results in balanced games anyway.