On other Stackexchange sites, usually when a moderator performs the "Comments have been moved to chat" action, she moves all of the comments (under a particular Q or A) to chat.
Here though, it seems that at least one moderator routinely chooses to move some but not all comments to chat.
For example, at this answer to the question "Does any beach in Sentosa Island in Singapore allow swimming after 7pm?", Willeke chose not to move to chat this comment:
in Singapore, you should assume all rules are implemented at all times
I fail to see how this particular comment "request[s] clarification or suggest[s] improvements". As such, I fail to see why this particular comment was not also moved to chat.
How does the selective move to chat here work?
Are there any objective criteria by which moderators here may choose not to move to chat particular comments?
Or is it entirely a matter of the moderators liking some comments more than others and so choosing not to move those comments they like?