How does that matter? Parent-poster asked about sincerity of thought, not originality.

If the spouses-to-be at a marriage ceremony say "I do", would you leap up from the audience to denounce them as frauds because obviously they heard the vow-formula before a hundred times? Hopefully not, and not only for reasons of decorum.

In contrast, most of the LLM slop I deal with from coworkers involve statements that--while less formulaic--are ones they can't even recall saying and are unwilling to defend when questioned.