Insider previews should be for testing new features, apps, serious changes (lets say in the GUI, etc.) and receive feedback about them.
But just releasing one build after another every few days, without any noticeable changes is just annoying and doesn't help anybody...
And three more "extremely important" fixes...We fixed an issue where no note would have keyboard focus after minimizing then reopening the Sticky Notes app.
How many people will ever notice that, apart from the fact, that these few issues could be probably fixed with a 50MB patch.
Why release a new build for these trifles?
However, each as he likes.