I am using content frequently.
What would it be replaced with?
How can we set the text of a view then? I'm using content, because it can contain html, whereas if we use the \Atk4\Ui\Text element, html will be converted into text.

In all atk4/ui classes which use content property all works as before.

Bare View class however newly will not contain the content property.

So the question is, if you are using View class directly (with content property) or extend View class in your code (again with content property).

I am using View class often for simple views or Fomantic UI elements or fast prototyping of controls saving time to explicitly extend that class.

In all atk4/ui classes which use content property all works as before.

Bare View class however newly will not contain the content property.

So the question is, if you are using View class directly (with content property) or extend View class in your code (again with content property).

I am using view directly. What about creating a new extended class named "\Atk4\Ui\Content" which can have the content property?
Btw: I don't get the reason, why it makes sense to remove the content property? What does it make better?

I am using view directly. What about creating a new extended class named "\Atk4\Ui\Content" which can have the content property?

That is how it is done - the class is named ViewWithContent.