Fedimint is a solution for people who aren't comfortable with the idea of "being your own bank". These people realize the stakes are too high if they mismanage their own keys. They understand that the current banking system enables rehypothication and financial fuckery (and they want out). They are ok with the idea of being able to hold their wealth with a 'bank' that is run by a group of 'CEOs' they either personally know/trust or they know hold similar values/beliefs as them. They simply would want a solution that allows them to transfer value, without knowing how the infrastructure works, but knowing their money will still be there when needed. These people may know what self sovereignty is, but it is lower on their hierarchy of needs compared to simply preserving their wealth/purchasing power. As time progresses, they may become interested in increasing their self sovereignty, so they will exit the Fedimint system and secure their sats on their own (in addition to spinning up their own node). Or, they may even become a federation themselves, to help those in their own, more condensed circle.

I see Fedimints to be akin to modern day credit unions. They are institutions correlated around a commonality, a membership. You must be referred by someone already a member. Certainly credit unions have slightly better benefits than banks when it comes to managing member's money. They are more personal and aren't beholden to shareholders. The members are the shareholders.