On Mon, Jun 15, 2020 at 08:26:46AM +0000, Gregory Heytings wrote:

[...]

> It's not just that particular use case that I have in mind.  As I
> wrote earlier, the feature I have in mind should not be an
> additional (minor or major) mode, but a core feature [...]

I'd recommend to aim lower at first. The modes and packages are a big
help for people not to step on each other's toes. Trying something
new with the approach "I think everyone should have it" is a tall
order, especially with a community as diverse as Emacs.

Cheers
-- tomás