The new Opportunity actions are FANTASTIC!
One issue:
How else can we tell a workflow to update an opportunity if one exists, but to create an opportunity if one doesn't exist?
A possible solution (which is already being used elsewhere in HighLevel):
Give the 'Find Opportunity" action an extra option, like the "Google Sheets: Lookup Spreadsheet Row" action has.
Add the option to "Create New Opportunity if one doesn't exist yet".
This shouldn't break anything and will solve the issue much better than can be achieved with current methods.