In my opinion, Vue Composition API is a blessing for experienced developer that has more opinionated codebase and needs to abstract and compose the functionality, with proper typings. But, it's also not necessary for simple use-case of Vue component.
The concern that I can see is that, any new libraries or tutorial will move towards composition API, which splits the gap further with the common Vue interface.
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I may understand your concern.
In my opinion, Vue Composition API is a blessing for experienced developer that has more opinionated codebase and needs to abstract and compose the functionality, with proper typings. But, it's also not necessary for simple use-case of Vue component.
The concern that I can see is that, any new libraries or tutorial will move towards composition API, which splits the gap further with the common Vue interface.