No they are deleted, you can't use the app after that unless you re download the app from the App Store. Nobody said you could chose default apps, yet.Its thanks to Android turning on the heat on Apple. Althouth I am glad he changed his mind about iPad on iOS 11.ios 11 update on iPhone is nothing compared to what the iPad got. Getting the 12.9 iPad later this month.
Tim Cook always needs the competition and his customers to tell him what he needs to do. It took the iPad sales nosediving for years before he finally came to his senses with the file manager and the other features which should have been added yesterday. Same goes for OLED and wireless charging. I cant think of a single worthwhile feature which Apple added suo moto ever since Tim Cook took the reins.
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They aren't deleted. Apple only hides the icons and unlike Android if you encounter a related link to the app anywhere it wont redirect to the installed app and ask you to reinstall the stock apps
Further to your "opinion" Because you "can't think of a worthwhile feature " the world does not agree with you, as Apple is taking a nose dive toward 1 trillion dollar valuation. You might want to review the hundreds or thousands of updates added since the 5s.