If a Lazy Builder runs into a problem, then there is no indication to the user that something has gone wrong. If most of the content is being loaded via lazy builders, it looks very confusing to see blank areas.
Enable Big Pipe and use a lazily-built block. Simulate an error by throwing an exception in the block code.
Show a placeholder message, and make it possible to theme this.
Currently an animation can be added with CSS -- see https://www.lullabot.com/articles/quick-tip-add-a-loading-animation-for-... -- but it would be good to be able to theme this.
Figure out how to do it.
Do it.
Lazy builders will show some sort of loading indicator.
None.
None.
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
@TinaRey: Indeed!
And … as of ✨ Interface previews/skeleton screens through optional "preview" or "placeholder" templates Fixed landing last week, there is no reason to implement this anymore — that is far more powerful than what this was proposing!