Here are the answers I got back from Google:
Question 2: What is the relationship between Location Groups and non-Organizational accounts? If different, this would explain why we were unable to transfer listings from Location Group Full to Location Group Empty as the Account was different.
The main difference I can think of is that Organization accounts require LGs below them and personal accounts don't. If the transfer isn't removing access from the source LG, sounds like a bug -- can we get a video?
Question 3: For locations that we have created in the Organizational Account from scratch, what is the most effective way to transfer them into another Account en masse since transferring them to a Location Group and sharing access to that Location Group with a G Suite account does not seem to be working?
Sharing access and then removing access to the LG should be the solution for this, I guess. But, is this just a workaround to continue receiving notifications?
Question 4: Are we correct in assuming that the Location Group functionality only works for ‘normal’ Accounts to share Location Groups with Organizational Accounts, but not vice versa (for Organizational Accounts to serve as a medium to transfer listings between different accounts)? Perhaps we are doing something wrong?
Not sure whats being suggested here. Once again, a video would help because I think access controls for LGs should be the same across personal and Org accounts.