True, but like I said, there wasn't a penalty for getting the extra lessons in iM@S360. The "penalty" for letting things go too far in the wrong direction is the risk of having your idol not show up. (I'm not sure if there were other low-tension disadvantages...more "bad" slots in a memory appeal, maybe)
That being said, the extended lessons and "bonus" lessons weren't called Hell Training, either...
Speaking of no-shows, I just read a bunch of iMAS2 stories from Dengeki Online, and in one of them it's mentioned that your guests for the quintet live may or may not show up depending on your level of trust/relationship with the characters you invite.
Another thing I found interesting is that on top of managing money and number of fans, there's also a "fans' attention level" that you have to keep in check by having your idol unit appear in TV performances and stuff. If your unit hasn't performed for a while in a certain area of Japan, the attention level drops and your fans will decrease for that area.
Also, it looks like your unit's ranking in the charts depends on the number of Perfect appeals you score during live performances. Stars appear during Perfect appeals, and they're tabulated to improve your position on the charts - if the song your unit performs is one that's been tailored for one of your idols (like Go My Way for Haruka), you get more stars for Perfect appeals, resulting in a better chance at ranking higher.
Wow. There's just so much more depth in iMAS2 than before.