I think one of the major selling points for Meteor.js was overlooked - Meteor's out of the box data flow between the client and server is done real-time through WebSockets. This comes without any of the usual clunky setup that you normally need to go through when writing real-time APIs.
This makes Meteor is a solid choice for rapidly developing apps that heavily rely on real-time data updates.
Having tried several different solutions for developing real-time applications. (Plain Socket.io and Redis, Laravel Echo, Feathers.js, Wolkenkit) Meteor really stands out for its excellent development experience and fast development cycle.
However, one of Meteor's major benefits may also end up being one of its biggest downsides; Having Meteor do everything for you makes it a not-so-flexible solution.
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