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Well I have a decent amount of volume in the legs. Ive climbed 31,000m this last 3 months. Probably at or around sweetspot for the most part.
So im only presenting half the argument. Doing these short dharp workouts without that behind would be a bit fruitless.
So i agree that you need both broad types of training.
All im saying is, that its the supra threshold interval stuff you add onto your base fitness. That sees the quicker FTP gains.
This discussion came from someone commenting that they have suddenly seen a massive reduction of available training time. That person already being quite fit. Seemed intervals were the answer. As has been said. Aerobic fitness degrades far slower. So he should be able to hold onto that.
But volume is still the biggest factor that affects improvement IMO. Intervals have their place in a time limited training program, but you'll never improve long term without increasing volume over time, and you can't just keep doing more intervals. Need longer sessions at lower intensity to increase training load.