Multivolume archives, recovery options and repair features, encryption... Sooo many possible reasons to choose rar over other formats.
WinRAR has one feature I wish 7-Zip would add. When selecting multiple zips, you can extract each to their own subfolder with a single command. I miss that more than anything.
You can do that with 7Zip as well, its a part of the context menu for that.
Yep, it even names the folders after the zip files' name. Right click, 7zip >
"Extract to /*"
This must be new! I've got my context menu customized everywhere I go might be why I missed it.
Perhaps they need to send archives to an automated process that only accepts rar files and no one wants to touch it to support other formats because the guy who built left the company decades ago and the system has quietly just worked without trouble over all those years.