When i place an asset in Inventor and i don't change anything the sketch stays simple.
When i place an asset in Inventor and i change a parameter i get the detail sketch.
When i place my imate panel who is not a asset i get the detail sketch and i then suppres some flange and then i get the simple sketch.
I try to make an ilogic rule so i suppress the flanges when i sync to acad, that wil solv my problem i hope.
If you are placing a 2D sketch as your factory asset and want to dimensions to stay invisible within Inventor, right click on the sketch in the model browser (prior to publishing the asset) and uncheck the "Dimension Visibility" option. Then when you publish the asset, there is no sketch in Inventor. Even after I selected one of the asset variants, the sketch still remained invisible. Hopefully this helps with your situation and have a blessed day!