I agree on it being a problematic word

As far as I am concerned, if one actually cares about the debate they should just replace "mature" for what they think it means or implies for the behaviour of the individual

Replacing the symbol for a definition is quite handy. People get all defensive over being called privileged, but change "privileged" for "having good circumstances" ( or similar ) and they don't feel called out for it despite having the same meaning

IMO it's something of a shame how much the human cognition is crap at that kind of stuff