New weatherboards are full of knot holes

We are replacing all the weatherboards on our house and the new ones that are going up are riddled with knot holes (between 8-10mm diameter); some of these knot holes have even dropped out leaving full thickness holes. Our builder reassures us that these will be filled and once everything gets painted, we won't notice them or have any trouble in the future. Is this true?
I'm worried that we're going to have to redo weatherboards in 5-10years and as our place is double story it'll mean scafolding, etc - $$$ - so we want to get it right the first time.
He also said that this is pretty much the standard of weatherboards nowadays; our stuff has come from Queensland and is pre-primed.
Any comments much appreciated.


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