LTNman I think you are saying that if runway length is available you should take it- can't dispute that.
One then comes to a definition of available-if ATC ask whether you can accept an intersection departure they have their reasons (avoidance of delay/traffic deinsity) so do you take it.
Then a straight commercial ops decision- backtracking takes time, wears brakes and tyres, uses fuel. Does that justify intersection departures?
Companies seem to differ on policies for this. At LTN Easy, Ryanair and less commonly Wizzair seem to accept intersection departures; I know sectors are often longer and that prohibits alone but I am sure they are are lighlty loaded sometimes and could on a Palma or Reus but TOM and MON flights don't seem to.
Is this pilot decision or SOP governed?