The Palace said at the outset, quite clearly:
"The Princess of Wales appreciates the interest this statement will generate.She hopes that the public will understand her desire to maintain as much normality for her children as possible; and her wish that her personal medical information remains private. Kensington Palace will, therefore, only provide updates on Her Royal Highness’ progress when there is significant new information to share"
Since they have have confirmed that she hah left hospital, that she was spending half term with her family at Anmer, and that she is progressing well.
They were quite correct in predicting the interest in her condition, at any rate! But they clearly set out what is to be expected. You think you deserve to know more - that’s not their problem. They are acting entirely in line with what they said they would do.