Errors are silenced by default so that no bad info can leak from broken apps.
We have plenty of mechanism that deal with reporting errors to users when appropriate.
Instead, we should fix these.

Errors aren't silenced by default, only when Debug component is enabled. Since it's enabled by default in app_dev only, this effectively means it silences errors for developers only. In production, it doesn't do silencing, because it's not enabled. Docs seem to have my back in this:

The Debug component provides tools to ease debugging PHP code.

You should never enable the debug tools in a production environment as they might disclose sensitive information to the user.

So I don't understand what's the issue with this patch, nor why was that line put there in the first place. It's really contraproductive. I want all errors shown when enabling this component. I don't want to be pushed to comment out Debug::enable() line in my index.php each time I get blank page.

We have plenty of mechanism that deal with reporting errors to users when appropriate.
Instead, we should fix these.

Well I thought this is one of them and I am fixing it? You have better fix in mind for cases like I have shown in linked issue?

Here is the fix #25408
Thanks for the reproducer in #8703 (comment)