Info Meteor auto scan template

Hi guys i have create one app with this command

meteor create app --full or --minimal ecc

when i insert e file and create e template tag the meteor recognize automatic template widthout import html file of a template example in Flowrouter.render

But if i create with

meteor create app

i must import html file of template to render this

Why???

what module or npm scan template in any files? where is the istrction? How i trasform second app like first?

Thank you in advance for any answer.