Ow does this form fit with the characteristics of the Romantic period (refer to Chapter 22 in the text)?

On page 193-194, Hoffer states, The most important type of program music is the tone poem, or symphonic poem. It is the rather long, complex orchestral work in one movement that develops a poetic idea, creates a mood, or suggests a scene.”

Many Romantic composers still wrote the more traditional multi-movement symphonies (such as Brahms). Some composers (such as Tchaikovsky and Schumann) wrote multi-movement symphonies which are considered programmatic. But these are also not single but multi-movement works.
How does this form fit with the characteristics of the Romantic period (refer to Chapter 22 in the text)?
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