Some of the criticisms of Meteor are out of date. Last year Meteor added exact code splitting, making it a cutting-edge and industry-leading JavaScript build tool. Also, the criticisms of Meteor as something that doesn't scale are out of touch with the current state of the product. Pre-2017 Meteor had difficulty scaling due to its method of oplog tailing wiht Mongo. But last year Redis-Oplog made that a thing of the past. With regard to SQL and other databases, Apollo addresses scaling concerns.

As a relevant data point, Qualia uses Meteor and recently raised $30M.

https://blog.meteor.com/dynamic-imports-in-meteor-1-5-c61304...

https://blog.meteor.com/modernizing-the-real-estate-industry...

https://www.forbes.com/sites/omribarzilay/2018/03/07/qualia-...