I use the Eraser mode a lot in my experiments. Instead of drawing with pure white, I draw with “Erase” mode activated, and it can give some interesting result/look. And if you’re like me, someone who uses the Erase mode a lot, you will soon find out that it can be a hassle to toggle it on and off (unnecessarily). This is because you don’t know whether you’re currently in Erase mode or not. Yes, you can look at the toolbar to find out, but the problem with that is that artists tend to look at the Canvas more than anything else when drawing. Furthermore, if you’re in fullscreen mode, there’s no way to tell.
My suggestion for the developers: When in Eraser mode, change cursor to red or make it to have different Outline Shape / Cursor.