Apple on stage highlighted several new iOS 13 features that went unmentioned during the keynote event, including a quick mention of a new option that will let you download "large apps" over cellular.
Apple says that in iOS 13, you can choose to download apps and games over your cellular connection, which means you'll be able to download larger (or any) app you wish using LTE.
Apple last week upped the over-the-air download limit for apps from 150MB to 200MB. In the Settings app of iOS 13, there's a new "App Downloads" option that lets you choose whether to Always Allow downloads of any size, ask if downloads are over 200MB, or always ask first before downloading over cellular.
The file size limit has always been in place to prevent iOS users from accidentally downloading large apps over cellular and eating up their data allowance, but such restrictions are no longer be necessary for some users thanks to the proliferation of unlimited data plans.