I think people are getting some wrong ideas from what you posted, which is not unusual on the internet. Some are concerned that you are going to think that, having done the online classrooms, you are now certified at that level. Some seem to think that exploring the intellectual content of classes above your diving level may have a deleterious effect on your decision-making or judgment.
Personally, when I finished my OW class, I bought the Encyclopedia of Recreational Diving, which was billed as the textbook for the DM class, and I read it cover to cover. (I also went on to read virtually anything I could find on line about diving, decompression, and related topics.) I totally understand enthusiasm and curiosity. I recommended the UTD online classes because I think it's a great idea to broaden one's exposure to ideas and opinions.
I wonder what you bought for gear, against 99% of the recommendations? If you valued our input so little, why did you seek it?