There are other uses of the slash character. It's a poor choice.

_ or | get my vote, but it's a bit late now to fix the mistakes of the past. There are enough special chars needed anyway that collisions are inevitable.

At least they didn't pick 'E'.

The problem with those characters is that they require you to hold shift to type them on a standard keyboard. Also, they make you reach in a way that / doesn't (now I'm showing my pro-/ bias).

On which standard keyboard?

Each country has a different layout, are you aware of it?

In most European countries both types of slash require two key presses.