"Freebie" raid bosses are those first few bosses in a raid that are pushovers and are usually downed in the first raid night/week.
My question is why does Blizzard still offer so many freebie raid bosses? In the days of only 2 raid difficulties, freebie bosses made a bit more sense as there were absolutely no other raiding options if you could not down the first boss in Normal (back then).
Now we have 4 whole raid difficulties that cover such an enormous range of raiders. We no longer need the first few heroic bosses in a raid to be Normal difficulty. I feel that this is a complete waste of development resources as the raiding content is consumed much faster. While it theoretically may be a 10 boss raid, there are only really 7 bosses that you will be progressing on, making 30% of the content obsolete in week 1. 30% of the entire raid tier work is consumed in week 1. This consumption of content makes the wait between tiers much longer and is not sustainable from a development point of view.
What I propose is that the raid difficulties are much more linear. H Iron Reaver for example would be much closer to H Mannaroth in difficulty. This would make progression more interesting and last longer. If people want freebie bosses they can lower the difficulty and farm gear there since we have so many of them.