Yes, that was one of the points I’d made in my censored post. There is a circle for who this is dogma, despite there being even less proof that “X species does not feel pain” to pin that teaching to with any scientific rigour. It’s a status maintained by peer pressure, and the social consequences of the alternative being true, not by good science.
The research of Monica Gagliano on plants had some neuroscience folk up in arms with their knickers all a-twist - not because they could fault her methods or her results - but because it could not possibly be true since they had already declared that kind of behaviour to be strictly limited to things they considered had a brain and a nervous system.
If you’re not familiar with her work, here’s as good a place as any to get an idea of what to search for: https://en.wikipedia.org/wiki/Monica_Gagliano - but really, go read what’s in her published papers, not the pop-science explainers of them.
There’s a very long list of things which were historically unimaginable to, or dismissed by, science because it didn’t fit into some now discredited, and/or overly simplistic model of how things work. I don’t think it’s a matter of if this will be added to them, only one of when.
I grew up being taught, and mostly unquestioningly believing, the view that I’m now asking people to question. But nobody taught me to disbelieve that. It’s been the long slow accumulation of my own personal experiences watching, and taking the time to learn how to interact with, more and more species, in more and more complex ways, that makes more and more of what I have been taught look very, very, questionable.
It’s funny how we project the things we aren’t familiar with to be something the people before us must have understood even less about. People who never see the night sky (because even if they got up from their television at night, their brightly lit city would obscure the majority of it), sometimes believe wildly inaccurate things about what the people who lived before electric lighting understood was up there.
People who take language classes before traveling must have a hard time understanding the people who were excited by travel to unknown places with no knowledge of who they would meet or what language they might speak. Yeah, some of those people got killed in misunderstandings - but many more progressed from simple non-verbal signals and expressions of good will to complex understanding, communication and ongoing relationships. We somehow seem to forget it’s how all of us learned as children, and how we learned to communicate with our children.
So when you see something or someone writhing in apparent agony - are they somehow not in pain because they don’t know how to say Ouch in your language, or because you don’t think they are as smart as you? Or does it just really not matter whether their pain is exactly the same as your pain, when it’s clearly obvious they are showing signs of it.