You have unrealistic expectations as to how interactions with Apple Engineering will go.
Basically it's usually:
- Apple Engineering reaches out to ask for more data.
- You provide the data.
- You will be thanked and will hear nothing more until a fix is announced at some future date.
Apple will not keep you informed, tell you what they are thinking or otherwise reach out to provide updates except maybe to ask you to test a possible fix. That's simply Apple's culture; even other groups within Apple aren't always updated as to what other groups are working on except on a need-to-know basis.
What you call "going MIA" is the way interactions with Apple Engineering work.
Particularly if it's something they can reproduce in-house, there's no need on their part for further interaction.
If you want that type of hand holding, you'd best choose another hardware vendor or an ISV prepared to offer that level of support.
Also, once again, if a post was deleted, it was because it violated the Apple Support Communities Terms of Use, one of which is that speculation as to the cause of issues or future products or software updates is forbidden as speculation.
These forums exist solely for Apple users to receive help from other Apple users, not from Apple, and not to report issues or concerns. Interaction with Apple, while it does occur, is on the level of a celebrity sighting at a mall in Los Angeles; it happens but should never be expected.
You and others here are having issues, that is clear, but your official channel is through Apple Support, not here.
Posts that violate the Terms of Use will be and will continue to be removed by the moderators, that's literally why they are here.
For what it's worth, I understand when driving the MBP 16 the fans go nuts and thermal shutdowns often result; ask anyone that's ever used a MacBook with an external monitor and they will tell you the exact same thing will occur; photo editing on an external 19" monitor with a MacBook was a recipe for thermal shutdown of a properly operating unit in less than ninety minutes, repeatedly.
Just because you can do something doesn't mean it can be done on an extended basis without consequence, and that's why it's both important to test a particular configuration and why Apple has a fourteen day full return policy.
From what it sounds like, you would be much happier with a new Mac Pro, which is specifically designed to operate with those kinds of loads on an ongoing and extended basis.
