I'm not sure there's much in the game that contradicts what you're saying.
RimWorld neanderthals can hunt, craft, use fire, and have complex spoken interactions. They can carry out rituals, bury the dead, hold and spread complex beliefs. They can form complex relationships with each other and with humans, who they can also interbreed with.
You talk about real neanderthals sewing, burying the dead ritualistically, doing art. RimWorld neanderthals do all this (in addition to building geothermal generators and interstellar spacecraft, FWIW).
None of this contradicts them being less intelligent than baseliners. There is a very broad spectrum of intelligence between a modern human and the cartoon notion of a proto-human who can only grunt (barely verbal) and swing a club.
If you IQ tested a population of neanderthals where would they score on average? Nobody really knows of course, but I don't think it would be 50, nor would it be 100. It'd be somewhere b...
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