Yes, lots of.
But there is a lot of brainwash, superstition, fraud and trickery out there, too. So one has to be very careful to choose from the texts or especially when choosing ones teacher. It isn't always easy to distinguish the unnecessary from the essential.
And one shouldn't expect too much.
That is quite true. I would avoid texts, in general, and focus on individual teachers who have "unusual power" and skills, and teach their method openly. The terminology they use correlates with the principles and body skills they teach, and thus it serves as part of the learning tool ... instead of as a confusing bunch of words and poetry that a student can't connect directly to what they are doing in practice.
A great example of descriptive terminology that works with the body skills, is I Liq Chuan, a contemporary "mixed martial art" derived from several old, traditional internal systems.
Daito-ryu could have a similar language to aid in its transmission. If I am not mistaken, some independent DR teachers are developing such language and utilizing it in their teaching.