This is perfect timing! I just finished Year 2 yesterday.
From memory, you use the chair the first six months, and then it comes back in for a couple of levels in month 12. I too got completely frustrated, especially in month 12. I completely agree that I feel some of the moves are gimmicky and make no sense. I wish they would show you Maria and Stacy actually getting into the positions they're in on the chair because I would have to freeze the TV and work over a minute just trying to get in some of those crazy side planks etc. I
finally figured out that if I use my step bench, I could fake a lot of the moves with it. Plus, sometimes just trying to hold the positions on the chair left my form lacking. Once I felt more stable on the bench, I could focus better on correct form.
I have to say, as much as you hate the chair, you will hate the hoop even more. I was cursing that stupid stinking hoop by the end of year 2. I looked ahead into year 3 and thankfully I don't see it anymore. How I HATED that hoop!
I'm actually getting ready to go do Year 3, Day 1 and I'm really nervous. I'm excited that Tracy is back in these but previewing, it's almost an hour and there are 13 moves per leg in the muscular structure.
I agree that you should do what you can and move on. As much as I find myself cursing Tracy, I have to admit there is some magic in her insane method.