The word 'remains' is correct and usable in written English. It can be used as either a noun or a verb, depending on the context. For example: Noun: "The remains of the destroyed building were scattered about the area." Verb: "The snow remains after the storm.".
"Marriage is the union between a man and a woman, has been historically, remains so.
Much remains to be done.
Unemployment remains high.
One question remains unanswered.
It remains true today".
"The state of Georgia remains an extreme outlier in requiring that defendants prove they have mental retardation 'beyond a reasonable doubt'.
That remains unlikely.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK