The presupposition that anything is killing Emacs - much less this - requires concrete proof. Because if anything, in my (likewise subjective) experience it's the complete opposite. I see more forum activity from newcomers and more high quality packages emerging each year than ever before.

> like an insistence to not using fast native libraries

How? Even disregarding graphics and font stack which almost entirely leverages native libraries, my Emacs build links against gmp, libpng, librsvg, zlib, alsa-lib, libxml2 and so on. 27.1 introduced jansson for native json parsing over pure elisp, from 28.1 we can basically AoT compile elisp to native code using libgccjit, master branch (29) even bundles sqlite these days. That is not to mention module system had been stable for a while, and lot of packages already use this to offload computation heavy stuff to native code.