For context, currently 97.5% of active iOS users are on iOS 18 or above, meaning that 97.5% of iOS users are able to use Mlem.
Supporting a version incurs an ongoing development cost for us. Changes we make have to be tested on more versions, and we're limited in which of Apple's APIs we can use. Dropping support for older versions allows us to focus our time on making Mlem the best it can be for the majority of users, as a modern iOS app.
With our current development capacity, it is not feasible for us to re-add support for iOS 17. You can find more details by reading our compatibility plan here.