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For a website, if the cause of the error is something internal to the server (a bug or other temporary condition), what could possibly be gained by telling the user the reason why this failed? "An error occured, try again later" is the only actionable information you can possibly give them, if they have no access on your server to fix your bug.

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How do I know if it's an internal error or if I did something wrong? And yes, showing users the internal errors is useful as they can report the issue with the error message, saving developers time in searching.

Input validation is a separate thing. If a user provides bad input, yes, the server should return an appropriate error code and human-friendly message. _Lacking_ sufficient validation is a problem that could result in an internal server error that could be resolved by changing inputs, but the validation doesn’t exist so the server cannot inform you of this.

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