Waschke was about a minute forty over the world record in 1962 so that would be like running sub twenty eight today and he was once running 10,000s in over forty minutes. You might think his training was ineffective but to me it seems very effective. It's similar to what Zatopek did. No, no one trains that way anymore but that doesn't mean it wasn't effective even if other things seem to be more so and I put this here more for an historical perspective than anything.
I get the sense that you have a problem with the time involved but Waschke's time commitment would have been pretty similar to Zatopek's. That was not uncommon at the time. Bob Schul wrote in his autobiography that he trained for an hour and a half in the morning and and another two hours or so at night. Gordon Pirie put in similar amounts of time. One "drawback" to a heavy interval approach is that you will cover less distance in the same amount of training time as you'd do with steady runs but you'll probably run faster when you are running.
But if you look at what Norpoth did you see that he probably spent less than half the time training that Waschke and Forche did. And van Aaken himself managed forty six something for 10,000 meters at 62 on that daily hour long 10 km. That's not world class for his age but many, probably most, 62 year old guys would be very happy with that time.