How do I create nodes with comments enabled using drush?
This is more of a workaround;
I can coerce all nodes to enable comments by running a query like this:
drush sql-query &quot;UPDATE node__field_mynode_comment SET field_mynode_comment_status = 2&quot;

I had a look at the database and found the node__field_mynode_comment table, which has a field_mynode_comment_status column. I found that the nodes with that column set to 2 had comments enabled, so I ran the above query to set it for all nodes, and now all nodes have comments enabled.
Incidentally I also tried creating the nodes with that field name ignored (--skip-fields=field_mynode_comment_status) but that didn't seem to have any effect.