In UFT, you can define objects in the OR to be under a Page, for example, and completely exclude defining the iframe where the object is really contained. There are many cases where leaving the iframes out work better.
Both samples will work fine:
Browser1.Page1.Object1.Click () 'if you place Object1 under Page1 and not under Frame1
Will leaving out the use of iframes work well in Katalon Studio?