@er1n modular overrides, mostly. i'm thinking of something like koken's plugin system where you can install something like photoswipe as the lightbox, or add bits of code into certain places, or load web fonts, or convert spotify/rdio urls into rich embeds, etc etc
in general, a plugin system should allow people to share snippets of code to make the experience better. consider: markdown, rich text editing, theming, and basically any longstanding PR/request in mastodon's github
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