This would appeal the privacy/security crowd, but it is not really Fairphone's market. There are better options if that's what you are looking for, such as the Librem phones.
They probably don't want to position themselves against security-focused phones as they would likely be compared unfavorably with them. That is unless they also do whatever it takes to enter that market, for example by supporting a security-focused OS like GrapheneOS.
They could have kept the headphone jack though, but I guess they wanted to sell their earbuds (with replaceable batteries! which is at least a good point).