I guess the key thing to note with workouts below 95% is how much do the mechanics change and if you employ these sessions with alterned mechanics for a period of time what impact do they have on race mechanics.
Intensive tempo gets you fit very quickly but how do you translate that fitness across to improved performance at higher velocities? If you can work out how to use it to do this then you have a reason to use it. If you can’t then what is the point?