Why respond in this dishonest manner? When I left Arch I had been using it for over 10 years. I probably still understand it better than you do.

Is your supposition that a "misconfiguration" just "happened" randomly over night?

No, it's a rolling release distribution, software on it will break randomly on updates. You need to read their FAQ, even their official document will tell you this happens and it's not their responsibility due to the rolling release nature of the distribution.