The phrase "It's pointless" is correct and usable in written English.
You can use it to express that something has no purpose or value.
Example: "After discussing the issue for hours, I realized it's pointless to continue the debate."
Alternatives: "It's futile" or "It's meaningless."
Exact(60)
It's pointless, given folk's idiosyncrasies.
"It's pointless.
It's pointless, it's tasteless.
"It's pointless [to continue].
"It's pointless," Dr. Morison said.
It's pointless getting into remorse".
It's pointless to discuss it.
"It's pointless," he says, flatly.
It's pointless to claim otherwise".
"It's pointless to unpack these things.
It's pointless Britain going it alone.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com