@dansup
Do you know what was the (well documented) feature of Instagram which propelled it to success before being acquired?

It seemed insta-nt. It did this by uploading your images while you were still playing with filters and writing titles and body text. You "never" needed to wait for upload to finish.

A lot of stuff, including Dark Mode, is very secondary compared to reducing the time people have to wait.
@pixelfed