[mulvya]

"deal with kidney stones down the line" isn't compatible with "not good for you even small quantities"

Some of those vegetables are staples in vegetarian cuisines like here in India. There would have to be a huge epidemic of kidney stones if the latter claim was true.

[tetromino_]

Cooking greatly reduces oxalate content. In Indian cuisine, greens are generally cooked, not served raw.

[citizenpaul]

Also it seems there is a huge oxalate absorption difference from person to person. Some people may not be affected at all.