My priority is rested pilots with a SIMPLE, EASY TO FOLLOW REST RULE.
Minimum rest period is 10 hours behind the door.
No rest period shorter than the preceding duty period, rounded up. 10:30 of duty? 11 off. 11:05 of duty? 12 off. Etc.
Cross more than 3 time zones? Additional hour of rest for each time zone crossed in excess of 3.
Simple. Predictable. Easy to calculate.
A one size fits all simple approach is nice, but it can ignore human physiology. It's not just how much time you get to rest that matters, but also what the flight duty day look like. Starting at midnight or starting your day at noon are two different scenarios. The same goes for how many flight segments you are expected to operate and whether or not you are flying across multiple time zones. I personally don't find the new rules that complicated. I've got an easy to use Quick Reference Sheet; provided by my union, which I've laminated and placed in my flight bag. Again it comes down to what your goals are. Is it a priority to be simple, predictable and easy to calculate, or to base your regs on the science of human physiology.