Is “it should be noted” associated with AI writing?
Strongly associated with AI writing, the passive sibling of “it is important to note.”
Why it sounds artificial
Passive voice plus importance-flagging: nobody is doing the noting, and the note hasn't been made yet. Just make it.
What to say instead of “it should be noted”
Example rewrite
It should be noted that results may vary between individuals.
Results vary: about one in five participants saw no effect at all.
Check your own text for “it should be noted”
Runs in your browser, nothing is uploaded. For all 221 AI phrases at once, use the full AI Phrase Checker.