When I first read it I really wasn’t sure what I felt, I’m still not sure. I think if there is a good reason, like @janbb mentioned safety, then it is ok. I could see an employee trying to insist on wearing their headdress, bracelet or necklace and wanting an exception for religious reasons. This ruling gives the company the law on their side for the safer measures they see fit.
Also, the company can require a uniform or dress code for many reasons. If the religious garments or jewelry might hurt their business they could possibly use it as a reason.
Regarding schools, which @janbb mentioned, but I had thought about it also, I have always been in favor of not allowing religious garments in public school, and probably I can be persuaded to not allow religious jewelry either. My feeling is the rules save the girls from the religious oppression that their families might be trying to raise them in. Not to mention other children might be cruel.
Even at work, it could be more comfortable for everyone if people are dressed similarly and religion and cultural differences aren’t right in your face.
Arguments on both sides are good, so it’s a difficult topic, but look at Iran, women are removing their headscarf at risk to their lives.