We were using exactly the same file for sizing Qlik Sense few months ago; definitely good to start with it. However - as you mentioned, many factors drive the sizing, so don't rely only on this document as you might have an unpleasant surprise!
Once you have your app somewhat ready and your Beta box setup - worth running Qlik Sense Scability Tool (please see: https://community.qlik.com/docs/DOC-8878#comment-48064) to get an idea on how your app could consume resources (CPU, RAM) and how the objects' response times would change in time on your current infrastructure.
We were using exactly the same file for sizing Qlik Sense few months ago; definitely good to start with it. However - as you mentioned, many factors drive the sizing, so don't rely only on this document as you might have an unpleasant surprise!
Once you have your app somewhat ready and your Beta box setup - worth running Qlik Sense Scability Tool (please see: https://community.qlik.com/docs/DOC-8878#comment-48064) to get an idea on how your app could consume resources (CPU, RAM) and how the objects' response times would change in time on your current infrastructure.
