I'm personally a fan of Mockup 5, as it brings continuity between the desktop app and the mobile app.
I strongly support the idea to bring back loading splash screens and loading screen quotes back to the desktop client. While it may certainly not contribute to optimizing the app per say, adding personality to the app adds to its general user experience. The Fluxer project is open source and is heavily backed by its active community. I think adding back quotes is a great way to recognize the people who have contributed to the project's success.
Furthermore, considering that Fluxer is self-hostable, giving instance operators the ability to add quotes by the communities that they serve helps personalize those instances to their communities. Should instance operators not care to show loading screen quotes for moderation reasons or other, then it should be toggle-able from the admin panel. Looking further ahead and down the line towards federation, should quotes be re-implemented, the instance that the user account originates from should be the instance that dictates the behavior of the feature.
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Comment by @xfalc0