Debian's /tmpest in a teapot

Except for the numerous times the technical merit of the "new" default has been explained, even in this thread. And then there's also the little detail where where the rest of the Linux world has been doing it this "new" way for about a decade. Those discussions (including technical arguments) are all part of their public record.

> "Only one reason is needed: I have decided as such."

Hate to break this to you, but the overwhelming majority of Debian packages also fall under this category - Both the packager and the upstream authors make countless such decisions every single day.

And again, if you (or whomever) doesn't like these decisions, feel free to invoke the Debian process for overruling a packager and/or upstream.