You are right, but those who set for themselves the goal to substitute a Linux/UNIX package must implement programs that handle correctly all the quirks of the existing Linux/POSIX specifications.

If they do not like the design mistakes, great, they should set for themselves the goal to write a new operating system together with all base applications, where all these mistakes are corrected.

As long as they have not chosen the second goal, but the first, they are constrained by the existing interfaces and they must use them correctly, no matter how inconvenient that may be.

Anyone who learns English may be frustrated by many design mistakes of English, but they must still use English as it is spoken by the natives, otherwise they will not be understood.