This seems to be a purely personal opinion with no concrete suggestions for changing anything. The idea of separating "classic" features from the more modern ones would be highly controversial, arguably the modern features make code clearer and simpler.

https://github.com/cplusplus/draft/wiki/How-to-tell-if-an-issue-is-editorial

I mean new grammar and classic grammar can be all there, but some of the new grammar is not so strict, I call them candy grammar, what about to seperate candy grammar and classic grammar in language level, something like namespace.

That's definitely not an editorial change, so this is the wrong place to propose it. It's also a terrible idea. Just because you don't value the new language features doesn't mean they should be relegated.

• Let me express my opinion more clearly
  C is perfect, but only experienced talented programmers can use it properly. If C can be used to write good programs, why make C++ more and more complex?
• Be concrete, take initializer_list for example
  1. It is not common to initialze a container (vector, list, ...) with hard coded constant values, isn't it? And I think it is not a good practice to hard code a vector / list, so the grammar should not encourage this, so no initializer_list. If the programmer need do it indeed, he/she can do it easily, even more suitable for his/her situation. The point is a good programming language should naturally encourage good programming .
  2. initializer_list introduce a new rule for constructor priorities, who a serious programmer wants to remember such a rule?

This is the wrong place to discuss your opinions on good use of C++. std::initializer_list is not only for initializing standard containers. Even if it was, there are valid uses for initializing them with constants, and initializer lists also allow populating containers from variadic parameter packs.

Just because you don't like modern C++ style does not make it inferior, and this is the wrong place to discuss it. Please find somewhere else, e.g. https://groups.google.com/a/isocpp.org/forum/#!forum/std-discussion