"lost its relevance" is a correct and usable phrase in written English.
Example: With the rise of technology, traditional forms of communication have lost their relevance in today's society.
I think it lost its relevance sometime around the second Labour government".
In general, Petterson's later novels look back to a historical moment when political action was exciting and necessary, from a present where it has lost its relevance.
This is why climate diplomacy as we know it has lost its relevance".
It premiered 49 years ago, way before computers, cellphones, OMG and LOL, but it has hardly lost its relevance.
Movies described as "apocalyptic," a term so overused that it has seemingly lost its relevance and importance, typically provide a vision of societal rebirth.
"The church has lost its relevance and maybe this is a way to find it again".
Yet if the small nations around which this event was founded can never afford to host it, then it will really lose its relevance.
But others, including people formerly and currently associated with Esalen, say it is losing its relevance in a culture where New Age has become a cliché.
It is only when marriage loses its relevance to communities, or is seen as outdated or unjust, that it risks becoming weakened or forgotten.
Whatever happens next, the proposed rules make it clear that the "made in" label is losing its relevance.
Animation will never lose its relevance.
