if file is not going to be modified (in the low-level sense - open("w") on the filename; as opposed to rename-and-create-new), then reflinks (what this app does) and hardlinks act somewhat identically.
For example if you have multiple node_modules, or app installs, or source photos/videos (ones you don't edit), or music archives, then hardlinks work just fine.
For example if you have multiple node_modules, or app installs, or source photos/videos (ones you don't edit), or music archives, then hardlinks work just fine.