In ArcPro, both the target feature and input features must be editable to perform the Modify Features -> Clip operation while editing. I'm not sure why this was changed from the ArcMap functionality, as I am not necessarily editing the Input Feature during a clip operation.
It's much easier to clip features (and prevent accidental clipping) if the Input Features are allowed to be non-editable. This was allowed in ArcMap, and a common workflow for me was to use a feature class that is not editable to clip other features. For example, if I need to trim vegetation features to their adjacent sidewalk features, I would use a sidewalk polygon to clip the vegetation polygon. In this case, the sidewalk features are not editable, nor are other features (roads, buildings, etc) in my map, so there is no risk of inadvertently clipping another feature that intersects the Input Feature - only the vegetation feature is clipped.
Now, in ArcPro, I have two options to ensure this - both add a bit of awkwardness to clipping tasks.
1) I have to carefully manage what layers are editable, and when I am switching between different Input Features to clip, I have to remember to change their editability (even though I'm not editing them). Further, I can't use the clip operation at all if my Input Layer intersects itself (by design, such as a bridge), requiring a manual geometry modification.
2) I have to uncheck the "Clip all editable features" box, and manually choose my input and target features for each clip operation (which adds more steps to complete a modification that was very simple in ArcMap).
If we just bring back the ArcMap workflow (and not require an Input Feature to be editable) this problem is easily solved.
