Critique of programming languages is useful to drive evolution, and helps programmers see pitfalls. However, making a good language is hard.
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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.
Blogging about my programming language project: choosing the basic syntax!
https://www.garden-lang.org/blog/syntax.html
It is remarkably hard to escape command line arguments safely on Windows, and the standard libraries of multiple languages have needed patching: https://flatt.tech/research/posts/batbadbut-you-cant-securely-execute-commands-on-windows/