I like A because it has been well researched and has been tested through and through thanks to PostCSS plugins, lightningcss,...
We can make PostCSS plugins for terser syntax and it is even possible to improve the native syntax later.
Which of the following best expresses how you want to write nested CSS when it's implemented by browsers?
A. I want to use & in every selector, as I think it makes code more clear
B. I want to be able to omit & whenever possible, as it's noisy to read and a hassle to type