i am not user of emacs, but looking into as next switch.

using mainstream more structured language is good point go into emacs.

it also will lead to rewrite of some plugins. for example many rust rewrites just better c versions, but more consistent and structured. there was not reason not to rewrite these in c but better. very good for newcomers to unix world.

another point is async. i have heard that is one of problems of no async. if emacs has plan it could be intresting either doing async or properly avoiding. for me it is prove point emacs will not die with its creators.