Yes agree on all your points. T. Combs and Haig Brown steelhead books are excellent. Deke Meyer and Arnold books are so so. OK I guess but left me somewhat disappointed.
A classic I highly recommend is Greased Line Fishing for Salmon and Steelhead - Jock Scott, Introduction by Bill Mcmillan. Copyright 1982 - Frank Amato Publications - Paperback.
Now I really learned somethings from this book. If you are into dry fly or greased line steelhead or salmon this is a must book for those people.
Also Lee Wulff - Salmon on a fly. Another classic from a master salmon fisherman, very applicable to steelhead fly fishing also.