Apple isn't in a position where they can please every consumer what decisions that they make with sacrifices one feature over the other. Now in the case of the headphone jack, everyone is aware of the dismay that if affected for those who appreciated it. One thing about this company, is there not afraid to take initiative and move forward with what they (Highly subjective) believe is better for the iPhone. In the case of touch ID and face ID, this is another method that may not everyone will agree with, but isn't necessarily a fair comparison to the headphone jack either, because it's more security oriented over a hardware feature.
But either way you look at it, when I see a post about those who doubt face ID. How can you doubt something that you have no idea the details or functionality behind new technology. I think it's a fair statement to allow face idea to have the opportunity to debut and then make the assessment rather you trust that Face ID is on par with protecting one's security. But there is one thing for certain, Apple is a company that values security more over than anything else, which I put my trust they know what they are doing in fold. I digress though, Face ID is also not an exception where Apple would release technology if it wasn't ready in the sense of protecting the consumers identity.