Reality is, anyone who is already engaging in high end content where such minor difference can matter is already theorycrafting and looking up every possible build for minor performance increases.
The players who get "trapped" by the talent system are new and novice players. However its very likely the people trapped at the same individuals might not even have interrupts or other utility spells on their action bars in the first place. So there actual effect is probably more negligible than most people realize.
I think where the new talent system will differentiate players is actually the mid tier. Players who might not optimize their talents for every encounter.