[quote=@Unoedipal]
<Snipped quote by Turboshitter>

I really don’t understand why somebody would want to app a Servant with parameters that are good but not outstanding, largely irrelevant skills, and a Noble Phantasm that’s functionally sealed in all useful sense. If you’re just after the breasts, there are easier ways.
[/quote]

I mean, it's as much about their role in the story as it is about their parameters. It's like why we have False Assassin around, when he only has one gimmick and is otherwise basically garbage as a Servant. But that might just be me.