Can you answer the question about what UTD suggests for 2 hour cave dives at 70ft deep? I felt I got a poor response in the classroom forum, any chance it could be cleared up?
RD 1:1 ratio is for dives in range of 80-170ft with bottom times 10-120 min, so it's not really included in that range. If it's not covered by RD, use deco software of your choice. If it is covered by RD, use deco software of your choice to validate results.
And yeah, RD is not always arriving with optimal answers. But that is the sacrifice we are willing to accept for a sake of simplicity and we do make sure that if anything it errs on conservative side.
No one in UTD claims that RD has all the answers and should be the only decompression method used. I'm not sure where did you got that impression. One of our instructors, George is actually successfully selling iPhone deco app.