Power Apps OnStart vs Named Formulas

When do you use OnStart and when are Power Apps Named Formulas useful?
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In this video you will learn when OnStart is used and how to use the OnStart Property in your Power App to save time updating your app. You'll also see how you to use named formulas to make re-usable items like searches or filters that you can embed wherever you need them in your app.

[@iamintractable1805]

I don't want to see the delegation triangles which is why I use a collection. Changes made to the data by other users running the app or directly in SharePoint do not cause the Named Formula to update (big drawback). In these cases, I have to refresh the Named Formula. So, if I have to update the Named Formula....I don't see any added value over having the app update the data source, and then apply the exact same updates the collection. Also, the Maker does not always handle direct changes to Named Formula's very well. If you have a complex app, it may throw hundreds of errors.