Already spoke with Wolfgang Mahnke about it. He supports this request.

For reference:
OPC 10030 3.4 and OPC 30050 3.8 are mentioning the following:

"This standard uses ModellingRule that are OptionalPlaceholder and MandatoryPlaceholder to define instance declarations, and defines a rule that the BrowseName of instance declarations having an OptionalPlaceholder or MandatoryPlaceholder ModellingRule be enclosed in angle brackets (<>). Originally, this rule is defined in OPC 10000-3 as a recommendation. This naming rule is also used in the description of a table. The BrowseName of a Node that has OptionalPlaceholder or MandatoryPlaceholder ModellingRule are described with angle brackets, which denotes that the name is not fixed. For example BrowseName of Property is described as <PropertyName> in graphical notation and tables results in a Property that can have any name."