This is a partial answer to the first three statements.
Manu Smriti's advice
However, discard the desire (kama) and material wealth (artha) if
contrary to Dharma; as also, any usage or custom or rules regarded
as source of Dharma if at any time they were to lead to unhappiness or
arouse people's indignation.
Manu Smriti 4.176
Attitude towards ancient ...