Assuming that "kdesu" is broken, there is plenty of time for "kdesu" to get fixed (and pushed expedited downstream because it's a bug fix!).
Maintaining bug compatibility is plain simply not worth the effort (and it is IMHO violating any sane open-source development model
where it's at least possible to *fix* bugs and not maintain an enormous amount of bug compatibility code - and maintenance effort - for ages.
Why else should Windows needs exponentially more resources with each release?).
If someone wants eternal backward bug compatibility, please *do* it - but do not complain to others or even ask them.
Especially not for some random buggy app which just happen to not trigger a race condition.
Copyright © 2017, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds