Okay, I think I understand: if your goal is to fully & maximally stress your aerobic energy systems, you can do so better by swimming continuously than by swimming intervals (regardless of pace).
Back to your statement that "anaerobic interval training alone will not tax the aerobic system optimally", it boils down to whether the extra aerobic training from an LSD session gives enough incremental benefit, or whether you're already at the point of diminishing returns after the aerobic training you have gotten during anaerobic sets. The answer to that question will presumably depend on how much time you have available to train, what your target events, are, etc.
Yes, I agree with all of that.
Okay, I think I understand: if your goal is to fully & maximally stress your aerobic energy systems, you can do so better by swimming continuously than by swimming intervals (regardless of pace).
Back to your statement that "anaerobic interval training alone will not tax the aerobic system optimally", it boils down to whether the extra aerobic training from an LSD session gives enough incremental benefit, or whether you're already at the point of diminishing returns after the aerobic training you have gotten during anaerobic sets. The answer to that question will presumably depend on how much time you have available to train, what your target events, are, etc.
Yes, I agree with all of that.