There’s a better argument for your position than simply saying AI-generated contributions are too long or repetitive.
Mumsnet is basically a place where people come to exchange experiences, opinions and advice with other people. We don’t always want factual accuracy or logical quality of the answers. People want to know what another person actually thinks, based on their own experience, rather than receive a polished argument assembled with technological assistance.
That’s not unreasonable.
There's also a distinction between using AI to help express an opinion you already hold and asking AI to generate an opinion for you. In the first case, the technology is assisting communication. In the second, it may be substituting for the very human judgement that makes a discussion forum interesting. We all have opinions that AI might not know about us.
Even if the resulting argument is coherent and factually accurate, something potentially important may have been lost such as how the person feels.
Your point about volume is also significant. AI makes it extraordinarily easy to produce lengthy, plausible-sounding contributions with very little effort. I’ve been amazed at how quickly it can produce a play. That creates an imbalance between the effort required to generate a post and the effort required of everyone else to read, understand and respond to it.
A person can produce several hundred words in seconds, while another person may spend ten minutes carefully considering the argument. If that happens repeatedly, the discussion can become dominated by material that nobody has invested much thought in producing. Too much information can turn people off and people won’t read it.
That isn't necessarily fair to other participants.
And while humans can certainly be repetitive, inaccurate or verbose without AI, the technology changes the scale of the problem. Something that previously required time and thought can be done in a few seconds. Unfortunately speed and presentation can mean people trust the response without understanding it.
It's an interesting discussion about the use of AI to help you write replies to posts and compose thoughts on MN and people do just want to hear the human.
And yes. AI can produce long tedious replies