I dunno I think dismissively quoting 19th century political philosophical divisions in response to someone pointing to the importance of real-world on the ground mass organizing is firmly in the realm of idealism.

The science of revolution requires a grounding in the conditions of the working class and an aptitude for organizing a mass base. Many anarchists are far ahead of many Western MLs in this respect, as being a Western ML is unfortunately often treated more like an identity or club rather than an activity or life dedication or science.