I find it peculiar that the plus and minus buttons on the WC single product page are added by javascript, but I suppose there is some good reason to go that route over php and templates.
However, because those buttons are added that way, there doesn’t appear to be a good way to change the characters used in those buttons. It would be nice to change those characters to up and down arrows/chevrons. Also, the use a regular hyphen for minus makes it too small, in my opinion. An EN dash or EM dash would be more suitable.
Is there something I’m missing that would make a change to these characters easy?