AMI Magazine had an article on these folks in this weeks issue. Specifically, why the Badatz came out strongly against them.
Because they insisted on their husband behaving in accordance with the Shulchan Aruch OH 240?
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Offen a Shulchan Aruch.
If you need to be so machmir on other things, the women will empower themselves to be makpid on what they want to be machmir on.