> I would expect a majority of nouns to be according to the animate / inanimate split
Well, as I understand, the actual animate/inanimate split was there at least 10 000 years ago (or more)! And the language has gradually changed over the years until it's barely recognizable. For half of the period that passed we didn't even have written languages, and can only approximately deduce the words by tracing their common origins in related languages.
See how modern English has changed in 500 years from the earlier Middle English — as a non-native English speaker, I can barely recognize a few things, and it's otherwise completely unintelligible for me. Now multiply that change by at least 20x.
So how words are split between genders in modern languages - has very little relation to how they were before. For example, in modern Spanish, masculine gender is a fusion of Latin masculine and neuter genders. So technically if we say that in Classical Latin there was still a statistically significant animate/inanimate split between masculine and neuter genders - nowadays it's the same single gender in Spanish.
Well, as I understand, the actual animate/inanimate split was there at least 10 000 years ago (or more)! And the language has gradually changed over the years until it's barely recognizable. For half of the period that passed we didn't even have written languages, and can only approximately deduce the words by tracing their common origins in related languages.
See how modern English has changed in 500 years from the earlier Middle English — as a non-native English speaker, I can barely recognize a few things, and it's otherwise completely unintelligible for me. Now multiply that change by at least 20x.
So how words are split between genders in modern languages - has very little relation to how they were before. For example, in modern Spanish, masculine gender is a fusion of Latin masculine and neuter genders. So technically if we say that in Classical Latin there was still a statistically significant animate/inanimate split between masculine and neuter genders - nowadays it's the same single gender in Spanish.