Runterwählen ist kein Gegenargument.
[Verifying my cryptographic key: openpgp4fpr:941D456ED3A38A3B1DBEAB2BC8A2CCD4F1AE5C21]
It depends. The RAR5 format used by newer WinRAR versions (the “old” one is still supported just well) can have smaller archives than 7z, but the opposite is also true. Still, yes, WinRAR is in my experience faster and more stable.
(Note that “as small as possible” is not usually the most relevant point. The best compression is currently reached with the ZPAQ format, but using it with maximum compression settings is painfully slow.)
It is. Coincidentally, security was one of the reasons to uninstall 7-Zip.
I’ve never found any reference material to confirm/deny.
It is incredibly hard to find mid-70s technical documentation on weird niche software like TECO Emacs. I mean, all of Emacs’s founders are still around as far as I know, so there might be a chance to find someone on the GNU Emacs mailing lists who knows how to reach out to them. While early Unix history is preserved rather well (thanks to Doug McIlroy and Dennis Ritchie who kept quite an archive, it seems), pre-Unix history predates public interest.
I have never asked myself when exactly the Emacsen had grown said capability. Now I’m intrigued myself!
WordPerfect is still quite awesome, given that it has Reveal Codes. However, the older I am, the more I grow to like WordStar (and its free clone).