Let's say you're on reddit and someone posts an imgur gallery, from an app like Boost you can view and browse that album without leaving boost.
But if I post a link to a mastodon toot that has 4 images, and I click the post in jerboa it will instead open a new window into the actual mastodon page.
I've argued for the value of "post once distribute everywhere" but if that paradigm isn't right for the fediverse at the very least the ux for linking mastodon image posts could be improved. Instead of posting once distributing everywhere it would be at least possible to post once and then link everywhere. (this doesn't fix issues like trying to get stuff like pixelfed working but it's worth a thought)
Tim Berner Lee has been working on this project called Solid. I'm a technically minded designer but still a designer and I don't have a real solid grasp on what Solid does, other than as I understand it it's a protocol to allow a User to go from website to website and share their data while keeping it on their system... or something like that?
Nextcloud recently announced Solid integration: https://nextcloud.com/blog/decentralize-the-cloud-with-fast-deployment-and-easy-backup/