Its a good question and I think I know where you are coming from.
A constructive post imo can be either technical, opinionated or advice based.
It doesnt necessarily have to be very longwinded but must have some sort of backup evidence depending on the reply.
While I am 100% behind the merit system i feel maybe its not working at its optimum.
I think I have posted good stuff like others but the merits are not flowing as well as they should.
( Nothing like blowing your own trumpet
)
Constructive posting is not difficult but at thw moment regarding merits it is subjective and there can be a lot of repetition.