Annotating a screenshot is faster than rebuilding the state in a design tool, and more honest: you’re working from the actual thing rather than a representation of it. Mark what needs to change, why, and where. A precise redline suggests a decision has been made. A scribble over a screenshot suggests a question is being asked, which is closer to what most feedback is. This works for AI prototyping too, annotating an output is faster than describing the change from scratch.
Save screenshots is what makes this possible, you need the material to annotate.