Why was Brahms considered to be out of date?

Johannes Brahms was often considered out of date because he adhered to classical forms and structures, such as sonata-allegro and symphonic traditions, at a time when many composers were embracing the more emotive and free-form styles of Romanticism, exemplified by figures like Wagner and Liszt. His music, characterized by its intricate counterpoint and traditional harmonic language, was seen as conservative compared to the avant-garde movements emerging in the late 19th century. Despite this perception, Brahms's work remains deeply respected for its craftsmanship and emotional depth, demonstrating a unique blend of innovation and tradition.