It's possible to reliably segfault Emacs when using undercover, at least on Travis: https://github.com/Wilfred/elisp-def/commit/57523ad268e0f4d2550386d45d55d7a6ed5fe50c
Not sure why at this point.
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Today I learnt that Emacs 28 shipped a context-menu-mode! https://oylenshpeegul.gitlab.io/blog/posts/20230129/
This seems quintessentially Emacs: deeply hackable, but building UI features in an order very different to the mainstream.
Designing UIs is such a hard problem.
Sometimes I try a bunch of options and I settle on "this one seems the least annoying".
Sometimes programming tools are so good that you miss them when using other languages. I see these mentioned the most frequently:
* IntelliJ (for Java)
* Slime+Emacs (for Common Lisp)
* Pharo (for Smalltalk)
I'm struck that they all have bespoke UIs.