I think you're right, but I also have some sympathy for the "dismiss the amateur" practice which you might come to share if you think of it as an optimization problem: if the cost of detecting bullshit is high, and the the cost of being taken in by bullshit is high, then heuristics like "has this person been validated by an appropriate pedigree" can be a smart solution when resources are limited. Especially in a field like philosophy, so richly infused with bullshit already.
