Can Big Upfront Architecture Document will be beneficial for the team

At times big upfront architecture document say about more than 50 pages document may not grab the attention of developers/other concerned parties. So we architects should be aware of creating architecture documents which are short and to the point. There is no point in creating big documents which no body interested in to know/refer. In my opinion, the architecture document shall be
1) Shall be simple and shall contain key architecture decisions. In my opinion with few UML diagrams and brief description should solve the purpose.
2) Update the document only if deemed to be necessary/otherwise don't update