Very nice list, thank you for the writeup and for sharing this! One interesting thing about the Emacs modes listed here is that many one of them are by themsel

Very nice list, thank you for the writeup and for sharing this! One interesting thing about the Emacs modes listed here is that many one of them are by themselves already enough to justify the use of Emacs for at least someone in specific application domains. For example, there are statisticians who do not use much of the breadth of Emacs, except for the listed ESS mode, and who do a lot of their work in that mode. The same for magit, Org mode, calc, dired, Tramp and others. In addition to this richness in features and flexibility, a major attraction of Emacs is that switching between all these aspects is instantaneous.