Bear in mind that in SCoB the amount of drops has already increased. There's 2 drops on T6, 3 drops on T7, 3 drops on T8 and 4 drops on T9. An increase from what the first turns had to offer.

Next to that, I don't think it'll truly matter for learning purposes on as to whether a raid has 4 bosses or 7 bosses. For those who struggle, the struggle will more than likely remain very similar. I do think though that for other reasons, general fun of progression through content, more bosses could be nice.

Which should go hand in hand with a reduction on time to clear the individual bosses. As as it stands now, quite a lot of bosses are stretched in time due to boss HP. In between tactics applied there's a lot of "downtime" of just mindlessly nuking. And if it does turn into a wipe, it's another 10 minutes down the drain. Personally I've always preferred more short-term fast paced encounters to combat that.

Just a troll boss in between with fairly easy tactics is also always appreciated. Turn 3 was a nice turn in that regard, if it would have offered a reward. Turn 8 comes close, although I think it's probably slightly too complex to truly be regarded as a troll. The gunship battle in ICC in WoW is a nice example. Having downed some more tactic heavy content whilst still progressing it's nice and relaxing to suddenly come by a fight in which you don't really have to think for a change.

A total of about 10-15 bosses in that is also something I wouldn't oppose to.