While both the Spending and Income tiles on the dashboard useful, a combined (like a net income graph) would be more useful:
For example, perhaps Spending is decreasing and shows as such in the dashboard tile graph.
Also, let's say Income is increasing and shows as such in the dashboard tile graph.
But what if: Spending is decreasing from $6,000 to $5,800 to $5,000 each month, and Income is increasing from $3,000 to $3,100 to $3,200 each month. Individually, the graphs both tell great stories but together, the story is that spending is drastically higher than income each month and is a problem to be addressed.
Combined tells a better and quicker 'story' of current finances, especially with Spending Plans and Watchlists already available to watch and tell the story of spending.