Here's why:
* Webern was a leading figure in the Second Viennese School. This school, which also included Arnold Schoenberg and Alban Berg, focused on atonality, serialism, and the exploration of new musical techniques. This is diametrically opposed to the characteristic features of Neoromanticism.
* Neoromanticism emerged in the late 19th and early 20th centuries. It was a reaction against the perceived coldness and intellectualism of late Romanticism. Neoromantic composers often drew inspiration from folk music, nationalistic themes, and emotional expressiveness.
* Webern's music is known for its brevity, austerity, and minimalist approach. He sought to achieve a highly concentrated and controlled musical language, using sparseness and precise structure. This is the antithesis of the lush, expansive, and often emotionally charged style of Neoromanticism.
While there might be some superficial similarities in terms of the use of melody and harmony, Webern's overall approach to composition is fundamentally opposed to the principles of Neoromanticism.
Instead of being a model for Neoromanticism, Webern's influence can be seen in the development of serialism, atonal music, and minimalist aesthetics in the 20th century. His music served as a significant inspiration for later composers like Pierre Boulez, Luciano Berio, and Karlheinz Stockhausen.