Hey Que...
I know how you feel. I had a similar reaction when I bought a top-of-the-line 2017 MacBook Pro and started having trouble with the faulty keyboard. Those experiences are indeed frustrating. And now, years later, I'm on that same 2017 machine and still occasionally replacing keycaps. The good news since is that Apple realized the design was a problem and has changed it.
That said, I've been using Apple computers since the Apple II+, with only a very brief period in the '90s when a job made me use a company-issued IBM Thinkpad. And over that time, the user-friendly reputation for Apple's/Macs/the OS has been well-deserved. Situations like this, comparatively, are very rare.
As for customers being the QA department for Apple, that's the purpose of this forum. It's designed so customers can help each other. You'll still find Apple Support and the Genius Bar in the stores generally very helpful. Though, in situations like this, reaching out to the customer community is actually better because they're more able to recommend granular solutions like this one.
About the Messages problem, can you confirm... are you using the steps exactly as outlined in Macrobin's original post or as I detailed for another user in a post not too far below this one? (The message with eight outlined steps, including emptying the trash before rebooting?) If that's not working for you, you might have a different issue.
What are the symptoms you're having?
P.S. Apple is usually pretty diligent about issuing a fix... eventually... and this seems to be a widespread issue.