That is done so that existing scripts keep working. Nobody complains about the LLVM linker installing itself as /usr/bin/ld, or systemd providing /sbin/init, do they?
* https://packages.debian.org/search?suite=jessie&searchon=con...
But maybe people fancy the new PCP Dstat and accept their losses. In any case, money rules the world, Open Source ran by volunteers is dying and becomes less and less attractive.