PowerBI basics, dataset size on disk, in memory.

Thanks for reply few follow-up question.

1) What was your PBIX size on disk that came up to 303.23MB in RAM.

2) I am coming from Qlik background and when we refresh dashboard we get 1 qlik file to update. However in PBI, I see that dataset is seperate then Report & Dashbord. In this case if we refresh dataset do Report & Dashboard gets updated automatically? 

3) If you buy premium per capcacity. $20k gives you 100GB of RAM, is that enough. If you have 5X20GB dashboard on disk, once they expand in RAM it will eat up all the memory. Currently with Qlik we have phycial server where memory is scaled up 512GB ram which can allow us to carry lot more dashboards in memory at much cheaper price. 

4) what are must have tools you need to install from Developer point of view & from Capacity Admin point of view.

5) I find central job management in PBI to be mediocore compare to Qlik. It does not have central interface which shows all the job, its run time, ability to view logs for things that failed. 

I am trying to understand concept before we make leap in PBI world.