HTML Frames Deprecated

Dear W3C Consortium:

Two questions:
   1. Why are HTML Frames deprecated?
   2. What alternate do you recommend?

Discussion:
I have been building an encyclopedia-style website for 12 years using frames:
http://www.nhmountainhiking.com/
I recognize some frame-related issues, but believe I have addressed them.
To me, deprecating this useful feature (frames) is like prohibiting 
high-performance cars because someone might speed carelessly.

Recommendation:
Please consider re-approving frames in HTML 5, perhaps including a short 
paragraph with recommended use.

Thank you.
Fred Shirley