SwiftPM been little trouble for me, with the most complex project involving a number of external packages and a couple of local ones. No crashes or anything like that.

It’s been way, way less trouble than CocoaPods was before I switched several years ago. CocoaPods was so bad about screwing itself up that I’d just check in its dependencies in a building state and avoid upgrading anything unless I absolutely had to, because inevitably when doing updates or even just resolving my project would somehow hit some number of the many edge cases that’d cause it to blow up.

In contrast with SwiftPM I keep most dependencies pretty close to current because it’s painless to do so.

In fact it’s been good enough to me that I wish it were possible to replace the awful mess that is Gradle with SwiftPM (or a 1:1 JVM counterpart) on the Android side. I need approximately none of Gradle’s flexibility and bells and whistles that make it such a pain in the rear, so something with SwiftPM’s simplicity would be a serious QoL improvement.