Looking at GitHub there are long lists of issues and uncompleted goals. The only activity is from the bot that keeps trying to update components with no human review.
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Therefore i wouldn’t consider the maps app as “dead”. As far as i know, it is a third party app though which is not developed directly by the Nextcloud GmbH but by volunteers. If you have a long term vision, i am sure that new contributors are highly welcome. Therefore i encourage you to get active yourself at the project or ask what’s needed to get done to release the new features you are waiting for Maybe a solution can be found this way or a freelancer can get hired to fix remaining issues (just throwing around ideas…)
Nearly dead with bare minimum changes would be more apt. And I’m not a developer so my contribution wouldn’t be useful.
I don’t have a vision for maps, I have it installed and just want it to work. Besides, there was already a “vision” for it, but that seems to have stalled a while ago.