I think a lot of the actual issues they're encountering are that the underlying POSIX APIs have a lot of sharp edges which the older versions of the tools have had enough time to work around, while the newer ones are generally running into the same rakes that have been there for decades. It takes a fair amount of time for those to be found and dealt with (though it also takes use, so it's a bit chicken-and-egg).

> since I usually found oddities that they probably did not intend to be that way.

Or it could be you don't have the context like they did. Maybe some hardware bug/quirk that happens on some exotic machine that you don't have.