Drop a control on constituent controls of a user control

[DataMiser]

Nah - there's dozens of scenarios where UserControls which contain additional Controls make perfect sense.
And I also don't see, where the "additional dependencies" would come from (e.g. when you use only VBs intrinsic
Controls as constituent Controls within an project-private UC, then there's not a single extra-dependency needed).

If you read the OP it says

a number of constituent controls (CommandBox, Label, TextBox controls as well as subordinated user controls).

But yes there are cases were a user control would contain more than one control, a textbox and a label for example, but when you start placing other user controls within a user control that can get ugly.