Small things like ‘Auto expand media’ being set to true, can have a huge impact on user retention rate.
The vast majority of people never open or change default settings in the social media they use.
When they try out Lemmy etc., and the defaults aren’t great a lot of them will have a bad User Experience and leave.
I’m a IT professional, and joined Lemmy a few months ago, the UX sucked, most of that could have been fixed by having good defaults in place.
I powered through, but I won’t recommend Lemmy to many of my friends or family because I know they will give up due to too much friction in finding the right settings and how things work.
For the Fediverse to succeed focus needs to be put on giving people a very smooth UX from first opening a app or page, to finding enjoyment seeing and engaging with content.
If people went as far as registering in a Lemmy instance, they clearly have some affinity towards the Fediverse. Getting through Fediverse to work nicely for them is what bridges the gap. It’s the same with anything people do. Better defaults is a trivial low hanging fruit that can help perhaps significantly.