SE(*) in DocGrammar under strict mode

Hello, 

I have an question about Document Grammars.

In 8.5.1 Schema-Informed Document Grammar, there is 'SE(*)' event 
which is evaluated by 'Built-in' Element Grammar.

But this rule (perhaps) can be applied under strict mode.

I think the principle of strict mode is that  if XML instance has 
an element which isn't defined in XML schema, encoder should stop
with some error.

I feel lacking of  consistency   between Schema-Informed Document
Grammar specification and strict mode.

How do you think about it?
Or were there any arguments?

Regards, 

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