I said that something exists in D&D only because of Tolkien, not really to fulfill a narrative niche (they certainly don't fulfill the ones in D&D that Tolkien intended for them in his stories, which are very specific to his stories and don't work in most D&D worlds, which IMO, is a good enough argument against Halflings being a core race of D&D).
And my response is that no, it's not a good enough argument. It's the very approach to revision that produced, for example, the commercial disaster that was the 7th edition of the
Joy of Cooking. It's the process, applied to social and economic planning, that produced the disasters documented in the book
Seeing Like a State. It is a fundamentally flawed approach to curation of successful systems, because it assumes that the curator knows everything important about the system. Since no human is omniscient, it's a recipe for failure.
So, you're saying that things that are already a part of the game are inherently exempt from criticism/possible revision because they've been successful enough to exist this long?
No, they're perfectly valid subjects of criticism. However, the proper standard for
action, for making an actual change, is not "I don't find it engaging", it's "This is actively hurting the system." Which you concede that halfings don't meet:
I'm not saying that Halflings are awful and are actively hurting D&D in general
Anyway . . .
Plenty of neutral/possibly detrimental traits are passed on to later generations through evolution. The bar for evolution (both genetic and cultural) is not actually "survival of the fittest", but is instead "survival of the fit enough"
Yes, this is absolutely true. However, quite often, traits that people examining a system
thought were neutral/possibly detrimental turn out to have been important to its success after they've been pushed out. Heck, people get surprised by occasionally discovering that things you thought were clearly and actively
detrimental turned out to be net beneficial (a classic example in evolutionary biology being the sickle cell anemia gene, which benefits most of its carriers by being anti-malarial). Given that, changing stuff you
just think is "neutral/possibly detrimental" is an easy way to do major damage by accident.