I have been training for 47 years now and find that what works at one time in training does not works so well at other times. One Coach explained it this way...you train where your weakness are to get better.
So if you tend to avoid the long slow runs like i did for years and years, guess what that turns out to be the thing i most needed.
People who don't like doing tempos are probably not doing them right. They are going too fast and/or trying to hit a certain time.
When i notice that preparing for a track workout stresses me out, i am trying to run the intervals too hard.
Running - training is about patiently doing the work - the moderate to easy aerobic work.
and finally, science is not leading the field, it follows the best runners and then tries to explain why what they are doing is working. and sometimes they get it wrong in their analysis...in part because not all great runners tell everything that they do.
I repeat the most important part of that:
science is not leading the field, it follows
science is not leading the field, it follows
science is not leading the field, it follows