Learning is not binary you learn or you don't. It is more a question of to what degree you choose to learn. Even to answer the question "what are you not interested in learning?" with, for example, "Angular", means you know enough about the subject to choose not to proceed further with it. If you are a backend developer you may have very little desire to explore frontend frameworks but you probably know what frontend frameworks are and their purpose, and I'd bet a lot more than you know about something else completely remote like molecular biology.
Personally I try to be familiar at a very high level with current trends in technology, looking out for things that could possibly help me be more effective day to day, at work or play. The degree to which I immerse myself is dependent on how promising the particular technology seems to me for the things I am working on, either professionally or as a hobby.
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