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I wanna hear the untold stories of the huge architectural and data migrations that go into the “smallest” changes like when Slack added the ability to add someone to a group DM and *move past messages* to the new conversation or how Amazon no longer asks which Kindle to send your library book to

At Felt, we changed the way map layers are nested, which was invisible for the user with the current feature set, but unlocked a bunch of other future features. It was an ~8 person, multi-month effort touching *a lot* of code; the near-term aim being “no one notices anything”.

If I recall correctly, it went down without a hitch and indeed, no one noticed anything.

Copy pasting of items between maps, copying styles, more complete control of styles via the GUI as opposed to JSON. Those things all could have been achieved before but there was a lot more stuff where children depended on their parent context, so it made it simpler to understand and implement.