@Lindy I'll bite. First, I love where the software is headed and I'm a fan. I may not agree with everything you guys do, ie search, but in general thumbs up.
Yes, I've been involved in large enterprise SaaS offerings, I've also built and sold 8 figure technology businesses, etc, so I feel qualified to chime in here. If this is the process you guys are following, clearly it is broken and needs to be addressed. There are complex bugs that you won't find in your "QA" process, noted, but there are also very simple bugs customers find immediately and are like "wtf!". I think these are the issues most folks are complaining about.
As you know, there are tools to automate most, if not all, of your QA testing process, simulating end users, every click path, load simulations, etc. They take time and proper talent to develop these scripts and keep them updated with new features and changes, but if done properly, they will catch 90% or more of the simple "bugs", and a high order of the more complex ones, if used properly.
And all of this, before an end user should/would ever see beta code.