I've never been cursed enough to interact with one in the flesh, but based on all their descriptions (and hoo boy do they love to describe), "girldick" is literally just old grandpa dick. Struggles to get/stay hard, doesn't ejaculate (or very little), small, etc. It's just penis but even worse. That's less desirable than what you started with, which was already not at all interesting to lesbians (or straight men, but "somehow" they're always safe from having girldick shoved in their faces...)

Offering "girldick" to lesbians is like offering a peanut butter sandwich to someone who's allergic to peanuts, and then when they decline, you drop the sandwich on the floor so it's covered in dirt, and then offer it again. The allergic person is still having none of your peanut butter sandwich, and worse yet you've rendered the sandwich in a condition that even a person who likes peanut butter sandwiches is no longer gonna be interested.