Ah, the age-old question of indoor training's effectiveness. How delightful. Let's dive into this complex issue, shall we?
First, let's establish the fact that indoor training is a "waste" of time and money only if you're not seeing any improvements. If that's the case, perhaps you should reevaluate your training approach, your power meter's calibration, or even your own abilities.
Second, gains from indoor training aren't a myth, they're just not a one-size-fits-all solution. The beauty of cycling is that it's a multifactorial sport, and indoor training can only address a few of those factors. You can't expect to become a master cyclist without ever leaving your pain cave.
Lastly, if you're consistently hitting your power numbers indoors but struggling outdoors, you might be overlooking the importance of bike handling skills, drafting techniques, and mental toughness. You know, those minor details that differentiate a casual rider from a seasoned cyclist.
So, to answer your question, the benefit of indoor training lies in its ability to complement your outdoor riding, not replace it. But hey, what do I know? I'm just a humble helicopter pilot from Tennessee who enjoys cycling and throwing around technical jargon.