My memory is fuzzy as well, but I recall some sparks here
https://lists.gnu.org/archive/html/emacs-devel/2013-12/msg00552.html I also vaguely recall that he didn't like the vibe of a part of the Emacs community and this was a factor in his ultimate decision to quit Emacs. It's a pity - for me he was a really great Elisp hacker and package maintainer.
On 19/02/2024 20:08, Bozhidar Batsov wrote:
> And the contributors to Flycheck and Flymake were always pretty
> different - part of the reason Sebastien (the original author of
> Flycheck) quit Emacs were some attacks he was getting on emacs-devel.
Speaking of attacks, I don't remember anything significant.
Sebastian's decision to shut the project down was quite a surprise at
the time.