Developing UI requires understanding users, mobile phones, and the servers they talke to. If you pick up one of these frameworks, and understand all of the periphery, I say it's highly likely you can adapt to the other frameworks.
There's no value in being a master of Flutter, React, or any of the frameworks. It's of value to become a master of mobile development. Understand the ecosystems, understand the users, the needs, the limitations, etc. Understand the mobile's role in a larger service offering: the backend, the website, the emails, the community, the whole service.
Achieving mastery is obviously a high goal, but there are many levels along the way. And all that experience should adapt to new frameworks, new phones, and new devices. Think about that instead of getting trapped in the tool-of-the-day.
With frameworks like React Native and flutter, you're relying either on the framework to give you access to underlying APIs, or the knowledge on developing your own integrations. And as great as these abstractions are, they always impose some performance hit.
Thank you for your response! There is a constant pressure, I feel, to need to have applications be catered for both Android and iOS crowd, as they are the dominant forces in the market - also suggested by companies who put React Native as their requirement for new hires. So I have been under the notion that the said frameworks are the way to go, which is the basis of a dilemma on whether to dive into these frameworks, or go deeper to gain a better understand of Android :/
Thank you guys for the responses! Really appreciate the eye-opening feedback considering that I am still learning along the way. Certainly has made the option to become a native developer more appealing :D
To answer your question more precisely:
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