We used Adobe Connect 11.2 (the newest) version for the premium sessions of LTDX February 2021.
I was lead producer for 30 sessions, with a mixed bag of content, presenter styles, presenter abilities and some other professional producers and others whom where novice producers and / or hosts... suffice to say quite a test of a platforms reliability and usability.
The first week was Connect v11.06, and about 15% of the audience insisted on using "classic view" when joining sessions, despite me asking them to use standard view.
The second week was Adobe Connect v11.2 (mandatory Adobe system upgrade on the Sunday).
Both weeks went well, with hardly any issues, but, week 2 with v 11.2 was the best from a quality, content & delivery, and system perspective.
With 11.2 you can enforce use of the new HTML5 "standard view".
This is the key part of the improved audio AND video quality, put simply, by removing the classic view the service (/servers) coped better, especially with higher audience numbers (which I’m not allowed to discuss in detail here, but, 'several hundred' people attended most sessions.
My only production issue encountered was a couple of presenters who could not install the revised Adobe Connect app, and, presented using the web browser client without a headset, their audio wasn’t as good as I wanted.
I now trust Adobe Connect again - welcome back old friend !