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Why is the three-branch family tree only a limited model of Slavic language history?

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Map of Europe showing the geographic distribution of Slavic languages, color-coded by language group: East Slavic (Russian, Ukrainian, Belarusian), West Slavic (Polish, Kashubian, Czech, Slovak, Sorbian), and South Slavic (Bosnian-Croatian-Montenegrin-Serbian, Slovene, Bulgarian, Macedonian). Striped areas indicate regions where bilingualism is common. — Slavic languages Distribution of the Slavic languages in Europe.

The traditional three-branch family tree—dividing Slavic languages into South, West, and East—is a limited model because it fails to capture the complex, fluid reality of their historical development.1

Rather than a rigid, branching structure, the evolution of these languages is better understood as a continuous process involving both differentiation and reintegration. In spoken dialects, linguistic frontiers are often not clearly defined; instead, there are transitional dialects that connect different languages across the Slavic area. Even where geographic barriers exist, such as the separation of South Slavs from others by non-Slavic populations, researchers can still trace remnants of old dialectal continuity between groups like Slovene, Serbian, Croatian, Czech, and Slovak.1

Ultimately, the Slavic linguistic landscape is characterized by a remarkable degree of uniformity maintained by these ongoing interactions, making a static tree model an insufficient representation of how these languages have influenced and merged with one another over time.1