Hello Mario, I tend to agree with Georg here. We are already two generations later.
You can also upgrade 6.2 installations to 7 without this feature in the old version.
“extensions that could help upgrading or migrating from TYPO3 CMS 6.2 to later TYPO3 versions” => this is hypothetical, or if you really need to create such an extension, it simply should be compatible with what TYPO3 6.2 supports at the time it was released (i.e. include the dependencies right along with the extension).
We did had the similar challenges back with 4.5 where the “upgradereport” extension had to be build with old 4.5 Extbase “coding style”. Not beautiful, but did the job.