Roughly speaking, if removing something might cause a lot of harm when doing so accidently, by erronous choice or without much contemplating, then user will be asked to confirm the removing of that something. Removing projects and image catalogs are such situations. Sometimes it is simply not allowed until something else has been done first. E.g. removing an image from image container, when image is still in use in a writing or removing image container, when its images are still in similar use. Removing a single writing or a writing collection does not raise questions asking for confirmation. It is recommended that projects that have been altered get backupped soonish.