> Discourse has one major technical challenge currently, that I know about. It doesn't work (for being logged in and interacting) on iOS 15 and older as of the past year. It's view-only for those devices.

The phones that can't upgrade past iOS 15 are over ten years old. What is the current iOS 15 user base? It's probably more cost-effective for Discourse to gift affected users a compatible device than to keep old code in place.