That nice exclamation expressing resignation seems rather old fashioned, right? The Beatles sang "let it be" 60 years ago, is this still current? What do you say nowadays in this context, is there any common or slang equivalent ?
I wouldn't classify this phrase as an interjection, simply because it isn't. MW categorises it as an idiom, at https://www.merriam-webster.com/dictionary/so%20be%20it
And people have traversed from so be it, let it be to just a curt, indifferent shrug to express nonchalance.
It is what it is, voted the Number One Cliche of 2004 by USA Today, and still current.
so be it = amen
This is really very basic.
"Amen (/ˌɑːˈmɛn/, /ˌeɪˈmɛn/)[a] (Hebrew אָמֵן, Greek ἀμήν, Arabic آمِينَ, Amharic አሜን) is a declaration of affirmation1 first found in the Hebrew Bible and subsequently in the New Testament. It is used in Jewish, Christian and Muslim worship as a concluding word or response to prayers.2 Common English translations of the word amen include "verily", "truly", and “so be it”. It can also be used colloquially to express strong agreement,2 as in, for instance, certainty, to be sure amen to that."
People says amen all the time in that sense. They also say: You got that right.
whereas "let something be" as in the song "Let It Be"
let (someone or something) be idiom Save Word To save this word, you'll need to log in.
Log In Definition of let (someone or something) be : to not bother or touch (someone or something) Please let me be. I'm not in the mood for company. That's a valuable vase. Let it be.