Earlier quoted context omitted.
Probably key point is "..with developers and all our users.." but not individual developers and individual users.
Key point is that words don't matter unless they're backed up by some concrete action. The worst thing about this blocking is that you often times don't get to see what's wrong. So you're running around in circles, trying to use various mx tools on the internet to find the problem. This is not just gmail issue. Though with many smaller providers you'll at least get something like "your blocked by XYZ blacklist".
I would much rather get this than silent discard. At least when I've seen things in the logs in the past (yes, I do read my server logs), I have been able to follow up and fix them. I get the sense that Google is even going beyond using 550 and discarding email silently. I just did a grep through my logs to see if this message came up and found it nowhere, yet I have users on my mailing lists claiming they don't get emails and they've checked their spam folders. They're on GMail.