It's a tool that's suitable for some purposes. A hammer is a useful tool but you shouldn't use it to put in screws.

If you need a more in-depth assessment, you'd need separate scales for:
Sexual attraction target
Sexual attraction magnitude
Romantic attraction target
Romantic attraction magnitude

I don't think it's a good idea to want to know these numbers about someone before dating them. That should be a very individual thing. Certainly it's a bad idea to pre-judge people based on such scales.

It may be a useful thing to know about yourself, but not necessarily. I can see it helping someone become more grounded and comfortable with themselves, but also limiting their growth or becoming tribal or obsessed.

The one place I can see such assessments being useful is in mental health statistics. For better or worse, sexuality and romance affect us hugely, sometimes in very bad ways. Mental health treatment could probably be better implemented if we understood more of how they work.