Why should you prevent a class from being subclassed?

Question :

Why should you prevent a class from being subclassed?,

Answer :

What can be reasons to prevent a class from being inherited? (e.g. using sealed on a c# class)
Right now I can’t think of any.

,

Because writing classes to be substitutably extended is damn hard and requires you to make accurate predictions of how future users will want to extend what you’ve written.

Sealing your class forces them to use composition, which is much more robust.

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The answers provided above are only to be used to guide the learning process. The questions above are open-ended questions, meaning that many answers are not fixed as above. I hope this article can be useful, Thank you