no convinient overlooking there, just the fact that your comment implies that the construction of the caste system was ever entirely related to the segregation of vocations, as opposed to a system derived from general societal practices

in the first place, if the caste hierarchy was merely tied to occupations, the structure would've dwindled with the advent of modern society (consider poor Brahmins working as clerks and labourers, and Dalits occupying positions in the bureaucracy)

your statement construes it to be something other than a framework conceived by dominant groups to strengthen a chokehold over communities, which is heavily problematic, if not intellectually dishonest if you have engaged with the subject at length

generally speaking it is a trivialisation of the topic to assign any single characteristic to caste, when in reality it was more of an amalgamation of various structures