While focusing on edges it’s helpful to overlap brush strokes for objects that are right next to each other, rather than painting up to the next object.
When you paint two things next to each other and never overlap your paint strokes on the edges you end up with some very hard and unnatural edges. This is even worse when you are painting up to an already dried edge.
So I tend to paint over edges of other objects all the time with the intention of coming back and touching up that object a bit. What you end up with is softer edges all over, but it’s easier to harden and edge when the paint is dry then soften it.
In fact if I made every edge in my painting too soft at first then in subsequent session added hard edges where I wanted the viewer’s attention I would be much better for it.