I think you'd find massive variances in different elite training groups and athletes in how or when they do these types of runs.
I've heard coaches talk about elite runners (predominately Africans) who do almost every normal distance run as a progression, where they start out very easy, progress into 'high end aerobic' paces, and push through into lactate threshold paces late in the run.
At a coaching clinic, I asked Joe Vigil about the benefits of training closer to 75% VO2 (roughly what you're terming high end aerobic) vs 65% VO2 (glycogen threshold). He essentially said there was none in most cases.
My personal opinion is its entirely up to you and your body. Some runners may find that high end aerobic runs don't allow them to prepare as well for a workout the next day, or recover from a workout the day before, where others might feel not feel significantly different going high end aerobic vs an easier pace in those same scenarios. So, if high end aerobic work is detracting from the other elements of your training, it probably isn't worth forcing it in (provided the other aspects of your training actually are worth it).