HostEurope: Why does WordPress not display error messages?

If there are e.g. technical problems with a WordPress website, the error messages are quite handy to get a first clue for troubleshooting. If the website is hosted at Hosteurope, these messages remain off and have to be activated manually in the backend of Hosteurope.
-> Administration > Webhosting > PAKETNUMBER > Scripts > Script Settings
-> Logging Output -> On

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