Having better guides is exactly what will solve the issue though. Unless you're making some kind of inherent argument, where all meditation is inherently nebulous and impervious to methodological approaches.

The guides may or may not be qualified. So the real problem is the lack systematization of it in meditation, more specifically a more reliable metric to judge "guides". As the extensive literature on meditation quite clearly outlines the limitations and dangers of various practices.

Tantra for example is quite clear about the dangers of practicing it.