The GNU tools and programs are, theoretically, created for the GNU system, which has evidently chosen to (eventually) not provide fgrep and egrep, as they are n

The GNU tools and programs are, theoretically, created for the GNU system, which has evidently chosen to (eventually) not provide fgrep and egrep, as they are not part of the POSIX standard. This is the GNU project’s choice to do. Other operating system projects, like Debian GNU/Linux, who use the GNU tools to provide their operating system, might choose otherwise and (separately) provide the fgrep and egrep tools. This would then be their choice (and one that I personally expect them to make). I.e. if you don’t run straight GNU as your OS, don’t complain about this; instead object if your operating system which you actually use or depend on choose to break behavior and interfaces which your programs rely on.