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Trying to pass those concerns off as minor considerations after the biodegradability and recyclability of wool is just... incredible. You wrote «is»: did you mean «would be»? Who is «trying to pass those concerns off as minor considerations»?
There have been in some areas bureaucratic issues with wool, as if it were "warning-label class material": this has / has had people check a few facts.
Edit: which by the way means, some wool may have been treated in a way that raised concern in public health monitoring entities. Think of the Amazon, but do not forget those thing that are there touching your skin. You could want to look into it.
Anyway: when the issue is with production, maybe there are ways to partially fix it. Were the material toxic, you'd have in a way a bigger problem.
And anyway, surely the vast majority of us HN members reasons through quantities and vets the given puzzle pieces to at least some extent: as ericd noted, Cost/Risks/Benefit analysis are duly as what you have are options, with different tradeoffs and complications, and having further promising ones is certainly beneficial.