This article (June 2018) says that feature layers participating in view layers with joins can't have their schema altered.
Is this information still valid?
We've been experiencing this with a hosted feature layer which may need to have changes to some field domains (from the Data tab in the item details page). This means we'll have to delete and recreate the view and the web map each time users ask for a change in a domain. And some extra steps to make apps use the new web map.
The weird thing is that in a test feature layer we were able to change field names and domains in AGOL after creating a view with it using the Join Features tool. I've been unable of reproducing this again but it makes me think there's an exception to this limitation. Am I right?