I definitely see your point, but the user is not entirely satisfied with having isolated points on the view. Is there any workaround to create a line chart in a situation like this?
The only method I am aware of to have a line between previous years is to split the viz into the 2 components - one for each year, and then a month by month sheet for the current year.
Step 1 - Create your year on year viz noting you wanted to display the last month of previous years - so the month(order date) filter is set to December
Step 2 - rinse wash repeat for the month viz, but this time set the year filter to the current year
Step 3 - dashboard it, I have left the header for the month on month sheet exposed to show I have set the filter to the same scale as the year on year sheet
Final product is a line chart where amounts are a running sum that reset every year. with connected points from different years
HTH 10.4 attached