A common way to use variables is to set and add values to them, so when doing this it would be great if it would show the custom description so that it's easy to see.
When you're working on a large project for a long time with lots of variables, it's handy to see the description in an easy to access and read place, without having to dig for it.
Here you can see I have the description but it doesn't show it very often in the editor:
Could easily replace the reminder text here:
This is now available in r172.