You are strawmanning, and your links are not countering any point I made. I never disputed the depreciation as fact, and I never recommended that beginners should use egrep over grep -E
I disputed your claims that the egrep command has just been a distro hack all these years, when in fact GNU to this day still distributes egrep through its source tarballs and only very recently started to warn about it through the wrapper script. And again, the only “portability problem” here is the fact that they deprecated it in the first place, i.e. a self-inflicted one.
Then as a Linux and Unix veteran I gave my subjective opinion by lamenting and criticizing the fact that this depreciation happened, and how changes like this always feel like unnecessary pedantry to me. Yes it’s an expression of frustration, but I am allowed to feel frustrated about it. I don’t need people like you invalidating how I feel about breaking changes in software that I use daily.