I am currently working on a web software project in the medical/health space. Of course its really good to know how the people that use the software work and what they expect and i am eager to learn those things, but i will not dive into a sector i am not really interested and absorb any and all information i can find, since i probably wont need it for the next project and it personally does not interest me a lot.

For technical domain knowledge i agree, but it also happens that this is often of personal interest to me anyway.