'''Edit artist credit''' is a potentially destructive edit type (which for that reason is also not auto-editable) and should not be entered without knowing what you are doing. Doing such edits by default when changing an artist name is antithetical to this.

And in many cases where an artist name change is wanted and legitimate, changing the old credits is unwanted. For example, if a band changes their name, their old entities should still use the credit under which they were recorded and released.