My thinking is that by awarding 20, 18, 16 for the podium & points scored over 5 rides for the rest, is this.
In my opinion, the LCQ should be just that. A last chance to prove that you can beat the guys who finished in front of you in qualifying. That chance is the reward for winning the LCQ.
If you give 16 points for trailing in last in the final, there's the potential to enhance a 6 point total by a further 10 points for winning just one race in 7 when a 15 point max in qualifying can only be enhanced by 5 by winning the final.
Going back to risk versus reward, I think that the the final would be much more competitive when there's potentially more points to gain by finishing 3rd, rather than one point difference to finishing last.
I think the problem that the FIM and others had, was when the guys who were holding the trophies & spraying champagne were outscored. I don't think many would have a problem with the last place rider getting only his qualifying score.