A frequent need for a flow is to message the creater of a file in a library. Currently, the only way to obtain creater, link to created file, etc. in order to send an email is to use the "File created in library - properties only feature". When creating a file in a specific folder, you get only limited information (no creater, no link). Therefore, to manage folder/libary specific triggers and cut down on the number of flow recrds initiated, the designer is forced to created lots of libraries in the site.
Suggestion: When creating a file, always in all cases provide all the relevant data atrtributes associated with the file, especially the ability to link to it and message the person who created it.