It is always the same issues in fact. You should consider your threat model before all. Then, consider the Signal app, then your iPhone supposed to be updated, trusted, with ADP enabled, biometric lock with erasure after 10 failures, etc. Then consider your ISP, then your country. Etc, etc. You should also compare the contexts. Is an iPhone “better” than a low or middle ranges Android-powered smartphones? For sure, yes. Is it better than high-range expansive smartphones with Android ? Or Pixel ones? Not that sure. And compared to GrapheneOS or /e/? Pretty sure not that much. You can also compare messaging solutions. Is Signal better than WhatApp? Of course yes. But what about XMPP and Matrix for example?

And what are your use cases? Remember your threat model. If you are an activist, a journalist or a whistleblower your needs may be different than a “commons citizen worried about its privacy.

In few words, the only pain point I see is the fact than iOS is proprietary and runs non libre source code and Apple devices than APN. But Android devices are not so much different. It does not mean the solution is not private or efficient, if we succeed in defining a definition of “private or efficient”.

In a nutshell, it could be considered as good. But not perfect.

Any ideas for E2E encrypted storage alternatives?

Enshitification made third-party apps disappeared. Prefer true open source project instead like Pixelfed for example.

It seems yet Bluesky has an Android app according to their GitHub repository (https://github.com/bluesky-social/social-app). However indeed nothing mentioned about F-Droid ; maybe some alternative Mastodon clients can also deal with Bluesky?