Got a new job at a fairly large IT firm which deals with large scale business software for customers like the government's various agencies.

The very first job I'm assigned to: we have to strip down this software and make it more general, go ahead and delete everything related to <feature>.

I haven't had time to get to know the product and I've deleted hundreds of files and lines of code from related files...

I have a feeling this will bite me somehow

Moving files is emotionally easier than copying and deleting files, and moving eliminates the risk of selecting the wrong files at the deletion part.

I have read that it is safer to manually copy and manually delete files rather than to move it, but copying and deleting has a hidden risk that was not mentioned: selecting the wrong files for deletion.

Moving files feels like moving an obstacle from one room to another. The deletion part of copying and deleting feels like destroying something, which is an added emotional barrier.

Technically, copying and deleting is safer, since there is no risk of source files being deleted without having been transferred as a result of a device disconnecting or the buggy media transfer protocol (MTP) failing to load the entire file list. However, on mass storage devices, this pretty much never happened to me, and on MTP, data loss can be avoided by not moving folders but opening the source folders and selecting all files and moving those out. This prevents a parent folder with incompletely loaded file listing from being deleted.

However, something that is not considered about copying and deleting is that the risk of selecting the wrong files in the deletion step exists. One might end up selecting files that were never copied.

Not only is moving straightforward and time-saving, but it has no emotional barrier and the risk of selecting the wrong files to delete from the source is eliminated, since a proper file manager like Nemo or Windows Explorer (mass storage only, not MTP) only deletes a moved file from the source after it has been properly transferred. The user does not need to pay attention to select the correct files to delete, since the file manager already did it.