whether 절과 be it 구문이 궁금해요

“There is little room for some of the aspects of their life that are most central to them, whether they are religious beliefs or cultural traditions.”에서 whether절은 명사절인가요? 앞 문장은 완전한 것 같고, whether절이 aspects와 동격인지도 궁금해요.
또 “Many people who suffer from addiction — be it addiction to alcohol, drugs, or food — experience...”에서 be it 부분은 어떤 문법 구조인가요?

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