Predicting House Sale Prices: missing values vs absence of the item

In the project “Predicting House Sale Prices” the columns ['Alley', 'Fireplace Qu', 'Pool QC', 'Fence', 'Misc Feature'] contain more than 25% of NaN values.

Dataquest drops those columns in their solution but in the documentation stays that NaN in those columns means that the item is absent, i.e., the house doesn’t have an alley or a fireplace. So we remove some useful information for our model.