It’s not unusual for sites and services to offer additional forms of protection on top of regular security features. Some of the bigger ones even go the extra mile, protecting from attacks up to a potential nation state level.
The most famous example of this recently is likely Google. Its Advanced Protection Program (APP) was deployed to warn people that Fancy Bear was on the prowl. We often see advanced security features like the APP feed back into security features for regular service users too. This is all very good.
What isn’t perhaps quite as good, is when not taking up the offer of additional security features results in a total lock out of your account. This is the complaint that’s been raised by many Facebook users over the last few days.