I think the issue with tempo sessions is that they should not be the central part of your training, but there is nothing wrong with them occasionally.
Any workout done too often will cause the body to adapt to the stimulus, and you will not get any training benefit. The particular problem with frequent tempo sessions is that the fatigue/benefit tradeoff is not there. The original idea was that they were perfect for time crunched cyclists, but that turned out, as you noted, to be incorrect.
Nonetheless, they are a good way (as the descriptions to the workouts you cited explain) to improve FTP when you are fatigued. They are also a way, if you are working on FTP, to vary the stimulus on your body. They might also be appropriate for longer FTP work. In the SUF Workouts, 5 x 6, 5 x 7, 5 x 8, and 4 x10 are pretty much at FTP, but 3 x 15, and 2x20 are tempo workouts.
I have done them when my plan called for them. Over the past 9 months they have had me do The Way Out three times, and Getting Away With It twice.