I send links to specific lines or chunks of code pretty much every day (using a similar VS Code plugin), usually to show an example of a pattern or show where / how a particular piece of logic is implemented. Or sometimes to give an idea of a possible home for a new piece of logic

I use a similar extension for VS Code. My use case is to share certain lines of code with coworkers. I didn't realize it would be so helpful, but I probably use it at least 3 times every day.

Maybe when you find a line you want to discuss/share with other people online?

I use it all the time, the Fugitive version, to share or point a block of code with my tram.

I will select a block, :Gbrowse, then copy and paste the url to my collaborators.

Basically a round about way of linking to lines a file.