The lack of a stable ABI means that the Swift runtime libraries have to be bundled into the apps, which accounts for around 10MB of bloat. Unfortunately, 10MB is almost unnoticeable on the scale of bloated apps these days. Does Swift do anything else to make apps bigger?

Could you please elaborate, or provide examples?

I can see how high-res pictures embedded in the app can add dozens of megabytes, and maybe a different runtime that you have to bundle for compat reasons, but multiple hundreds of MB?

Swift libs are ~ 10 MB, still 265 MB to go.