Wherever I comment, I challenge users who flame VGChartz and recommend them to go check the definition of the word 'estimation'.
Sell-through data doesn't get reported from anyone afaik, let alone shipments, just look at Xbox. Additionally, not even Circana provide sell-through data anymore (which they did back then, iirc).
And with the exception of very few markets, we literally don't get anything.
Official shipment data has always been the guidance for adjustments, and certainly you guys are not afraid to admit to that, even advocate for it in your disclaimer.
I'll never understand how anyone would get upset about your service. And last calender/fiscal year, too, the deviation of your estimates compared to shipment data (which HAVE to be consequential and reasonable by necessity) where "off" by a margin of under 5% - which ultimately can't be determined anyway since there are no sell-through data reports.
I may be disagreeing with your guys' Series estimates, but I can't deny that I don't have any factual proof of it, either.
So it's basically an open discussion, and perhaps somewhere in the future data will be provided/get leaked (which I am surprised it did not happen yet anyway).
In short - you're doing a great job. And I am advocating for a healthy discussion about you whenever I can wherever I spot flaming.