While you could make a case for Giant being more positive than negative, Dwarf/Albino/Scaly can hardly be said to be neutral. You actively cause fear and revulsion in the general populace by your mere appearance, so apart from game statistics I would say they are pretty negative.
You could perhaps make the exception that if you choose one of the negative/neutral traits as the trait to make more abundant in your dynasty, it would also be exempt from being affected by the level 3 legacy. That way you can make all your kinsmen dwarves if you want, but instances of dwarfism will still be reduced for the dynasties that would rather their members not have that trait.
This is pretty off topic, but I expect the Flavor Packs to introduce a lot of uniqueness to culturesThere seems to have been a focus on distinguishing cultures through innovations. The sad thing (at least to me) is that almost all cultural innovations are just a new type of MAA, so in terms of gameplay there's very little difference.
Though, to be fair, 95% of cultures in CK2 had no gameplay effect whatsoever beyond determining what other cultures you had opinion penalties with.
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