If you don't use the HTML path and ID fields, and you don't use Match Index, the interface will trawl through the web page looking for a duplicate element and error if it finds one - you could use exception handling to trap that error and do whatever you need to do.
Not using path or match index etc will slow down the interface a lot - so a better option might be to dynamically use Match Index, incrementing each time as your flow logic looks for duplicates.
