why are people afraid of modern text editors? Why cling to 1980s technology?
i.e. if you can't (realistically) choose your own tools, then your experience with the ecosystem is that of your experience with the tool. No tool can be a good experience for everybody.
I did not read it as "everything should support the UNIX IDE" as much as expressing a preference for it and that it's a red flag if you can't even use standard vanilla tools (e.g. grep) to do basic things in an ecosystem.
I think it's fair to say that you should be able to edit code in your editor of choice and not have a terrible time.
So if for language X, if I as language designer want to provide the same experience as Smalltalk, either I consider the interaction with IDE workflows, or I design command line tooling to go along the language (e.g. Go).
And the command line experience comes back again to the universe where it is more prevalent, POSIXy systems.
So I don't think I am making false assumption here, as one cannot have it both ways.
The above does not evince a fear of modern text editors. Nor does it equate to clinging to 1980s technology. Why do you think it does?
Just because something was created long ago does not mean it hasn't improved. Vim and Emacs are both extremely featureful and powerful editors and many people prefer to be able to pick and choose specific tools that do their jobs extremely well.
It's not about using "old" technology - it's about using a tool that excels at its targeted task, and letting you choose the best tool for ancillary tasks like searching, formatting, testing, debugging etc.